Construction site audio playback device, in particular construction site radio

Abstract

The invention relates to a construction site audio reproduction device, in particular a construction site radio, comprising an audio reproduction unit (12), a control or regulating unit (14), a battery interface (16) for receptacles for interchangeable batteries (18) that can be removed without tools and that are provided for supplying power to the audio reproduction unit (12) in at least one operating state, and at least one mains operation interface (20) that is provided for connection to an external power grid and that is provided for supplying power to the audio reproduction unit (12) in at least one operating state. It is proposed that the mains operation interface (20) be provided, in at least one operating state, for charging an interchangeable battery (18) accommodated in the battery interface (16).

Description

State of the art

[0001] A construction site audio playback device, in particular a construction site radio, has already been proposed, comprising an audio playback unit, a control or regulating unit, a battery interface for a tool-free receptacle for a replaceable battery, which is provided in at least one operating state for supplying energy to the audio playback unit, and at least one mains operation interface, which is provided for being connected to an external power grid and which is provided in at least one operating state for supplying energy to the audio playback unit. Disclosure of the invention

[0002] The invention is based on a construction site audio playback device, in particular a construction site radio, with an audio playback unit, with a control or regulating unit, with a battery interface for a tool-free detachable receptacle for an exchangeable battery, which is provided for supplying energy to the audio playback unit in at least one operating state, and with at least one mains operation interface, which is provided for being connected to an external power grid and which is provided for supplying energy to the audio playback unit in at least one operating state.

[0003] It is proposed that the mains operation interface be provided, in at least one operating state, to charge a removable battery accommodated in the battery interface. Preferably, the removable battery can be both charged and discharged via the battery interface. Preferably, the mains operation interface can be provided, in at least one operating state, to charge only a removable battery accommodated in the battery interface, or to charge a removable battery accommodated in the battery interface and simultaneously provide power to the audio playback unit.

[0004] In this context, a "construction site audio playback device" is understood to mean, in particular, a playback device for audio playback, such as, in particular, music playback. The construction site audio playback device is preferably formed by a construction site radio. However, it would also be conceivable for the construction site audio playback device to be formed, for example, by a Bluetooth and / or WLAN loudspeaker. The construction site audio playback device is preferably suitable and intended for use on a construction site by virtue of fall, dust, and / or water protection. The construction site audio playback device preferably comprises an analog and / or digital radio receiver. The construction site audio playback device preferably comprises a protective housing.A "protective housing" is understood, in particular, to mean a housing that protectively encloses at least one electronic component of the construction site audio playback device arranged in an interior of the construction site audio playback device. In particular, the protective housing connects and / or fastens various components of the construction site audio playback device. The protective housing is preferably designed to protect the electronic component of the construction site audio playback device in the event of a fall from a height of at least 1 m in such a way that no functional limitations arise. Advantageously, the radio housing protects the interior against environmental influences at least in accordance with protection class IP53, advantageously at least in accordance with protection class IP55.

[0005] Furthermore, in this context, an "audio playback unit" should be understood in particular as a unit designed to process and reproduce audio signals. The audio playback unit preferably comprises electronics, in particular with a signal receiver and an amplifier, and at least one loudspeaker. A "control and / or regulating unit" should be understood in particular as a unit with at least one control electronics unit. "Control electronics" should be understood in particular as a unit with a processor unit and a memory unit, as well as with an operating program stored in the memory unit.

[0006] A “battery interface” should be understood in particular as an interface that is intended to receive electrical energy from the removable battery, in particular a hand tool battery. Preferably, the battery interface is intended to mechanically secure the removable battery, in particular a hand tool battery. Preferably, the battery interface is partially formed integrally with the radio housing, specifically a part of the battery interface that mechanically secures the removable battery, in particular the hand tool battery. “Coupling” should be understood in particular as establishing a functional connection. Preferably, the construction site audio playback device has a battery receiving area that serves to spatially accommodate the removable battery at the battery interface.

[0007] A “battery receiving area” is to be understood as a space defined by the battery interface, which the removable battery occupies when attached to the battery interface. Preferably, the radio housing is in particular directly adjacent to the battery receiving area. In particular, the battery receiving area comprises a gap arranged between the radio housing and the removable battery coupled to the battery interface. Preferably, the battery receiving area has a cuboid shape. In particular, the battery receiving area is open on at least one side, advantageously on at least two sides, particularly advantageously on three sides. The removable battery is formed in particular by a hand tool battery. A “hand tool battery” is to be understood in particular as a battery that is intended to supply at least one hand tool with energy, in particular during an intended use.Preferably, the hand tool battery is connected to the hand tool in a ready-to-use state, in particular in a detachable manner without tools.

[0008] In this context, a “mains operation interface” should be understood to mean, in particular, an electrical interface which is intended to be connected to an external power grid, such as, in particular, a house grid or the like. In at least one operating state, the mains operation interface is intended to supply power to the construction site audio playback device, in particular the audio playback unit. Preferably, the mains operation interface is intended for direct coupling to a power cable or directly comprises a power cable. Particularly preferably, the mains operation interface has a USB interface to a power supply. In operation, the mains operation interface is preferably intended to be supplied with direct current via the USB interface.

[0009] The inventive design of the construction site audio playback device enables, in particular, advantageously flexible operation of the construction site audio playback device. The construction site audio playback device can be operated, in particular, advantageously with only one removable battery and without an additional charger, since the construction site audio playback device itself can function as a charger. Furthermore, carrying an additional charger is eliminated. In an advantageous embodiment, the construction site audio playback device can be operated and the removable battery charged simultaneously. This, in particular, advantageously provides a high level of user comfort.

[0010] It is further proposed that the mains operation interface is provided, in at least one operating state, to supply the audio playback unit and a removable battery accommodated in the battery interface with energy, in particular simultaneously. Preferably, the control or regulating unit is provided, in mains operation, to supply the audio playback unit and the battery interface with energy from the mains operation interface. Preferably, the control or regulating unit is provided to provide the audio playback unit with the required energy via the mains operation interface, with any surplus energy from the mains operation interface being fed to the battery interface. The control or regulating unit serves, in particular, for energy or power management. In this way, reliable operation of the audio playback unit can be ensured, and the removable battery can be charged simultaneously.This can provide a particularly advantageous high level of user comfort.

[0011] Furthermore, it is proposed that the network operation interface be formed by a USB-C interface. The USB-C interface, in particular a USB Type-C interface, is in particular a 24-pin USB interface for accommodating USB-C cables. The USB-C interface is preferably used to be connected to an external power network via a USB-C cable. The USB-C interface is preferably used in particular to provide power. In addition, however, it would also be conceivable for the USB-C interface to be provided for bidirectional power supply. Alternatively or additionally, it would also be conceivable for data to be transmitted to the construction site audio playback device or read from the construction site audio playback device via the USB-C interface.In particular, it would be conceivable for audio data to be transferred to the construction site audio playback device via the USB-C interface and / or for firmware updates for the construction site audio playback device. This would, in particular, provide a standardized network operating interface. USB-C enables particularly high performance and expands the range of applications. USB-C is emerging as the standard interface for supplying electrical devices with an external power supply. The increased performance of the USB-C interface also makes it possible to charge an inserted removable battery.

[0012] Instead of an external power supply via the USB-C interface, the network operation interface can also have an internal, permanently installed power supply.

[0013] It is further proposed that the construction site audio playback device have a charging interface for charging external devices. The charging interface is used, in particular, for charging a tablet, smartphone, or mobile phone, for example. The charging interface can preferably be used both for mains operation via the mains operation interface and for battery operation via the battery interface. In this case, it is particularly conceivable that charging via the charging interface is restricted or not possible depending on the charge level of the replaceable battery and / or the power requirement of the audio playback unit. Furthermore, the charging interface can be formed by either a wired charging interface or a wireless charging interface. The charging interface can, for example, be formed as an inductive charging surface, such as in particular according to the Qi standard.This can provide a particularly advantageous level of user comfort. The construction site audio playback device can also be used as a charger.

[0014] It is further proposed that the charging interface can be supplied with energy from the battery interface or from the mains operation interface depending on an operating state. Preferably, the charging interface can be used both during mains operation via the mains operation interface and during battery operation via the battery interface. In particular, it is conceivable that charging via the charging interface is restricted or not possible depending on a charge level of the removable battery and / or depending on a power requirement of the audio playback unit. This can in particular enable advantageously convenient charging of external devices. In particular, an external device can also be charged via the removable battery. This can in particular provide advantageously high user comfort. Preferably, the construction site audio playback device can therefore also be used as a charger and / or power bank.

[0015] It is also proposed that the charging interface be formed by a USB interface, in particular a USB-C interface. The USB interface is designed in particular as a USB-C interface, but a design as a USB-A interface would also be conceivable, for example. The charging interface is preferably intended to be connected directly to an external device, such as in particular a smartphone or tablet, via a USB-C cable. It is particularly conceivable that the USB-C interface can be used both for energy output and for data transmission. In this case, it would be particularly conceivable that audio data can be transmitted to the construction site audio playback device via the USB-C interface and / or that firmware of the construction site audio playback device can be updated. This makes it possible, in particular, to provide a standardized charging interface.

[0016] Alternatively or additionally, it would also be conceivable for the charging interface to have a USB-A interface or other USB ports, as well as other plug connections, via which electrical energy can be provided, for charging external devices.

[0017] It is further proposed that the control or regulating unit is provided to control a flow of energy depending on an operating state, wherein supplying energy to the audio playback unit has priority over charging the removable battery. The construction site audio playback device can be supplied with electrical energy via the mains interface, in particular with the aid of an external plug-in power supply. Alternatively, the electrical energy can be provided via the removable battery, in particular of different voltage classes. If both voltage sources are available, priority is given in particular to the mains interface. This means that the removable battery is not discharged in this case. It is further proposed that, when the mains operation interface is connected, the audio playback unit is provided to be supplied with energy from the mains operation interface.In this context, a connected network interface should be understood in particular to mean that the network interface is connected to an external power grid via an external plug-in power supply. In particular, the removable battery is only discharged if no plug-in power supply is connected to the network interface. In special cases, this prioritization can also be changed and the removable battery can be used, for example, as a buffer battery. The available energy is to be used to implement the electrical energy-based functions of the construction site audio playback device. In particular, the audio playback unit is to be operated with a first, highest priority. A second priority is to be used in particular to charge third devices via the charging interface. A third priority is to be used in particular to charge the removable battery via the battery interface.However, other prioritizations are also conceivable. With sufficient power supply, all three functions of the construction site audio playback device should be available to the user. A power shortage can occur, for example, if music is played very loudly through the audio playback unit. In this case, the audio playback unit's generation of acoustic energy should not be limited. Instead, functions are deactivated according to their priority. This can be described using different levels related to the radio's volume. A distinction must be made here regarding the power source used to power the radio.

[0018] The priorities depend primarily on the system architecture. Alternatively, the focus could be on charging the removable battery or charging via the charging interface. It would also be conceivable for the user to set the priority. If the priority of charging the removable battery is higher than that of the audio playback unit, the volume would have to be reduced at least partially, for example. The construction site audio playback device could also switch to an intelligent mode automatically or under user control. In this mode, the battery pack could be partially discharged even with the power supply plugged in in order to cover peak performance. This is particularly advantageous when converting electrical into acoustic energy, as short-term current peaks must be absorbed by the power supply, for example during bass reproduction.Such an intelligent mode makes it possible to downsize the power pack while maintaining the same acoustic output, or to continue charging external devices via the construction site audio playback device. If less acoustic output is required, the mains operation interface can again provide electrical energy to charge the removable battery.

[0019] Furthermore, the invention is based on a method for operating a construction site audio playback device. It is proposed that, in at least one operating charging step, the mains operation interface supplies the audio playback unit with energy and, at the same time, a removable battery accommodated in the battery interface is charged via the mains operation interface. The construction site audio playback device is supplied with electrical energy in the operating charging step or in a mains operation step via the mains interface, in particular with the aid of an external plug-in power supply. Alternatively, in a battery operation step, the electrical energy can be provided via the removable battery, in particular of different voltage classes. If both voltage sources are available, priority is given in particular to the mains interface. This means that the removable battery is not discharged in this case.In particular, the removable battery is only discharged if no plug-in power supply is connected to the mains interface. If, in a mains operation step, additional electrical energy is available in addition to supplying the audio playback unit and a removable battery is connected, the construction site audio playback device switches to the operating charging step, during which the removable battery is also charged. This advantageously enables, in particular, variable operation. The construction site audio playback device can advantageously be operated with just one removable battery and without an additional charger, since the construction site audio playback device itself can function as a charger. Furthermore, there is no need to carry an additional charger. In an advantageous embodiment, the construction site audio playback device can also be operated and the removable battery charged simultaneously.This can provide a particularly advantageous high level of user comfort.

[0020] It is further proposed that, in at least one battery operation step, the audio playback unit is operated via a removable battery accommodated in the battery interface. Preferably, the charging interface can also be supplied with energy from the battery interface or from the mains operation interface, depending on the operating state. Preferably, the charging interface can be used both during mains operation via the mains operation interface and during battery operation via the battery interface. In particular, it is conceivable that, depending on the charge state of the removable battery and / or the power requirement of the audio playback unit, charging via the charging interface is restricted or not possible.If additional electrical energy is available in the battery operation step in addition to powering the audio playback unit, and an external device is connected to the charging interface, the construction site audio playback device switches to a further operating charging step, during which the external device is also charged via the charging interface. This can, in particular, advantageously provide a high level of user convenience. The construction site audio playback device can thus preferably also be used as a charger and / or power bank. In particular, battery operation can also be enabled.

[0021] The construction site audio playback device and method according to the invention are not intended to be limited to the application and embodiment described above. In particular, the construction site audio playback device and method according to the invention may have a number of individual elements, components, units, and method steps that differs from the number stated herein to fulfill a functionality described herein. Furthermore, in the value ranges specified in this disclosure, values within the stated limits are also intended to be considered disclosed and can be used arbitrarily. drawing

[0022] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0023] They show: Fig. 1 A system with a construction site audio playback device according to the invention, which has an audio playback unit, a battery interface and a mains operation interface, and with a removable battery in a schematic representation, Fig. 2 a schematic energy flow diagram of the construction site audio playback device according to the invention and Fig. 3 a schematic flow diagram of a method for operating the construction site audio playback device according to the invention. Description of the embodiment

[0024] Fig. Figure 1 shows a system with a construction site audio playback device 10 and a removable battery 18. The construction site audio playback device 10 is formed by a construction site radio. However, another design of the construction site audio playback device 10 that would be deemed appropriate by a person skilled in the art would also be conceivable.

[0025] The construction site audio playback device 10 has a housing 30. The housing 30 has a substantially cuboidal basic shape. The housing 30 is formed from a plastic housing. The construction site audio playback device 10 further has an audio playback unit 12. The audio playback unit 12 comprises an electronics unit 32 with a radio receiver, an audio processor, and an amplifier. Furthermore, the audio playback unit 12 comprises, for example, two loudspeakers 34, 36. The audio playback unit 12 can further have additional loudspeakers. The loudspeakers 34, 36 are integrated into the housing 30. A region of the housing 30 accommodating the loudspeakers 34, 36 is rounded, deviating from the cuboidal basic shape. The construction site audio playback device 10 further has a control or regulating unit 14. The control or regulating unit 14 is arranged in the housing 30.The control or regulating unit 14 is provided for power management. Furthermore, the construction site audio playback device 10 has a battery interface 16. The battery interface 16 is provided for receiving the interchangeable battery 18 in a manner that can be removed without tools. The battery interface 16 is particularly suitable for receiving different interchangeable batteries 18, in particular interchangeable batteries 18 with different voltage classes. The interchangeable battery 18 shown is, for example, an 18V hand tool battery. The battery interface 16 is provided, in at least one operating state, for supplying power to the audio playback unit 12. The battery interface 16 is arranged on a rear side of the housing 30. The construction site audio playback device 10 further comprises a mains operation interface 20, which is provided for connection to an external power grid.The network operation interface 20 is provided, in at least one operating state, for supplying power to the audio playback unit 12. The network operation interface 20 is formed by a USB-C interface. The network operation interface 20 is arranged on one side of the housing 30. The network operation interface 20 is provided to be connected to a plug-in power supply via a USB-C cable 38 and to an external power supply, such as a home power supply or the like, via the plug-in power supply.

[0026] Furthermore, the construction site audio playback device 10 has two charging interfaces 22 for charging external devices 24. The charging interfaces 22 are each formed by a USB-C interface. The charging interfaces 22 are arranged, for example, on a front side of the housing 30. The charging interfaces 22 are used, for example, to charge a tablet, smartphone, or mobile phone.

[0027] The construction site audio playback device 10 further includes two handles 40, an operating unit 42, a display 44, and an antenna 46. The handles 40 are arranged on both sides of the housing 30. The operating unit 42 and the display 44 are arranged on the front of the housing 30. The antenna 46 is arranged on a top side of the housing 30.

[0028] The construction site audio playback device 10 can be operated in various ways. The construction site audio playback device 10 has mains operation and battery operation.

[0029] The mains operation interface 20 is provided, in at least one operating state, to charge a removable battery 18 accommodated in the battery interface 16. The mains operation interface 20 can either exclusively charge a removable battery 18 accommodated in the battery interface 16 or, for example, also supply the audio playback unit 12 with electrical energy and charge a removable battery 18 accommodated in the battery interface 16. The mains operation interface 20 is provided, in at least one operating state, to simultaneously supply the audio playback unit 12 and a removable battery 18 accommodated in the battery interface 16 with electrical energy. The control or regulating unit 14 is provided, in mains operation, to supply the audio playback unit 12 and the battery interface 16 with energy from the mains operation interface 20.Preferably, the control or regulating unit 14 is provided to provide the audio playback unit 12 with the required energy via the mains operation interface 20, with any excess energy from the mains operation interface 20 being supplied to the battery interface 16. When the mains operation interface 20 is connected, the audio playback unit 12 is provided to be supplied with energy by the mains operation interface 20.

[0030] Depending on the operating state, the charging interfaces 22 can be supplied with energy from the battery interface 16 or from the mains operation interface 20. The charging interfaces 22 can be used both during mains operation via the mains operation interface 20 and during battery operation via the battery interface 16.

[0031] The control or regulating unit 14 is provided to control an energy flow depending on an operating state, wherein an energy supply to the audio playback unit 12 has priority over charging the removable battery 18.

[0032] The construction site audio playback device 10 can be supplied with electrical power via the mains operation interface 20 using an external plug-in power supply. Alternatively, the electrical power can be provided via the removable battery 18. If both voltage sources are available, priority is given to the mains operation interface 20. This means that the removable battery 18 is not discharged in this case. When the mains operation interface 20 is connected, the audio playback unit 12 is designed to be supplied with power from the mains operation interface 20. The removable battery 18 is only discharged if no plug-in power supply is connected to the mains operation interface 20. In special cases, this prioritization can also be changed, and the removable battery 18 can be used, for example, as a buffer battery.The available energy is intended to implement the electrical energy-based functions of the construction site audio playback device 10. The audio playback unit 12 is to be operated with a first, highest priority. A second priority is to be used to charge third devices 24 via the charging interface 22. A third priority is to be used to charge the removable battery 18 via the battery interface 16. However, other prioritizations are also conceivable. With a sufficient energy supply, all three functions of the construction site audio playback device 10 should be available to the user. An energy bottleneck can arise if, for example, music is played very loudly via the audio playback unit 12. In this case, the generation of acoustic energy by the audio playback unit 12 should not be limited. Instead, functions are switched off according to their priority.This can be described using different levels related to the radio's volume. A distinction must be made here as to which power source powers the construction site audio playback device 10.

[0033] In mains operation, when the mains operation interface 20 is connected to an external power supply, four levels of the audio playback unit 12 are available. In a level 0, in which the audio playback unit 12 is operated at a moderate volume, all functions are available, so that both an external device 24 can be charged via the charging interface 22 and a removable battery 18 can be charged via the battery interface 16. In a level 1, in which the audio playback unit 12 is operated at an increased volume, charging of the removable battery 18 via the battery interface 16 is switched off. In a level 2, in which the audio playback unit 12 is operated at a very high volume, charging of an external device 24 via the charging interfaces 22 is also switched off.In Level 3, in which the audio playback unit 12 is operated at extremely high volume, a removable battery 18 located at the battery interface 16 is used as a buffer energy source during extremely high load peaks that exceed the capacity of the plug-in power supply. Level 3 is only available when a removable battery 18 is connected.

[0034] In battery operation, when power is supplied via the removable battery 18, three levels of the audio playback unit 12 are available. In level 0, in which the audio playback unit 12 is operated at a moderate volume, all functions are available except for charging the removable battery 18, so that an external device 24 can be charged via the charging interface 22. In level 1, in which the audio playback unit 12 is operated at an increased volume, all functions are available except for charging the removable battery 18, so that an external device 24 can be charged via the charging interface 22. In level 2, in which the audio playback unit 12 is operated at a very high volume, charging of an external device 24 via the charging interfaces 22 is also switched off.

[0035] Fig.3 shows a schematic flow diagram of a method for operating the construction site audio playback device 10.

[0036] The method comprises a commissioning step 48. If the construction site audio playback device 10 is activated, the control or regulating unit 14 checks in the commissioning step 48 whether the construction site audio playback device 10 is supplied with electrical energy via the mains operation interface 20 or via the battery interface 16.

[0037] If the construction site audio playback device 10 is supplied with electrical energy via the network operation interface 20, a network operation step 50 follows, in which the audio playback unit 12 is supplied with energy via the network operation interface 20. Depending on a level of the audio playback unit 12 and depending on whether a removable battery 18 is located in the battery interface 16, the control or regulating unit 14 switches to an operating charging step 26. In the operating charging step 26, the network operation interface 20 supplies the audio playback unit 12 with energy, while simultaneously a removable battery 18 accommodated in the battery interface 16 is charged via the network operation interface 20. In the operating charging step 26, an external device 24 connected to the charging interfaces 22 can also be charged.

[0038] If the construction site audio playback device 10 is supplied with electrical energy via the battery interface 16 and a removable battery 18, a battery operation step 28 follows, in which the audio playback unit 12 is supplied with energy via the battery interface 16 and a removable battery 18. In the battery operation step 28, the audio playback unit 12 is operated via a removable battery 18 accommodated in the battery interface 16. Depending on a level of the audio playback unit 12 and depending on whether an external device 24 is located at one of the charging interfaces 22, the control or regulating unit 14 switches to a battery operation charging step 52. In the battery operation charging step 52, the battery interface 16 and a removable battery 18 supply the audio playback unit 12 with energy, while simultaneously charging an external device 24 connected to the charging interfaces 22.

Claims

[1] Construction site audio playback device, in particular a construction site radio, with an audio playback unit (12), with a control or regulating unit (14), with a battery interface (16) for a tool-free receptacle of a replaceable battery (18), which is provided in at least one operating state for supplying energy to the audio playback unit (12), and with at least one mains operation interface (20) which is provided for being connected to an external power network and which is provided in at least one operating state for supplying energy to the audio playback unit (12), characterized by that the mains operation interface (20) is provided in at least one operating state to charge a replaceable battery (18) accommodated in the battery interface (16). [2] Construction site audio playback device according to claim 1, characterized bythat the network operation interface (20) is provided in at least one operating state to supply the audio playback unit (12) and a replaceable battery (18) accommodated in the battery interface (16) with energy, in particular simultaneously. [3] Construction site audio playback device according to claim 1 or 2, characterized by that the network operation interface (20) is formed by a USB-C interface. [4] Construction site audio playback device according to one of the preceding claims, characterized by a charging interface (22) for charging external devices (24). [5] Construction site audio playback device according to claim 4, characterized by that the charging interface (22) can be supplied with energy from the battery interface (16) or from the mains operation interface (20) depending on an operating state. [6] Construction site audio playback device at least according to claim 4, characterized bythat the charging interface (22) is formed by a USB interface, in particular a USB-C interface. [7] Construction site audio playback device according to one of the preceding claims, characterized by that the control or regulating unit (14) is provided to control an energy flow depending on an operating state, wherein an energy supply to the audio playback unit (12) has priority over charging the replaceable battery (18). [8] Construction site audio playback device according to one of the preceding claims, characterized by that when the network operation interface (20) is connected, the audio playback unit (12) is provided to be supplied with energy by the network operation interface (20). [9] Method for operating a construction site audio playback device (10) according to one of the preceding claims, characterized byin that in at least one operating charging step (26) the mains operating interface (20) supplies the audio playback unit (12) with energy and at the same time a replaceable battery (18) accommodated in the battery interface (16) is charged via the mains operating interface (20). [10] Method according to claim 9, characterized by that in at least one battery operation step (28) the audio playback unit (12) is operated via a replaceable battery (18) accommodated in the battery interface (16).

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