The invention relates to an at least partially computer-implemented method for determining a continued use application of a multi-module device battery (12) at the end of its service life in a preliminary application, in particular a first application, comprising the following steps: - Providing (S3) a current aging state of the device battery (12), a historical history of the aging state of the device battery (12), and statistical operating parameters; - Determining (S2) current aging states of at least one of the battery modules of a device battery (12) previously divided into battery modules (14); - Determining (S4) the historical history of the aging state of the at least one battery module (14) depending on the current aging state of the at least one battery module, the historical history of the aging state of the device battery (12), and the statistical operating parameters;- Determine (S7) predicted aging state profiles for multiple load profiles of reuse applications for at least one of the battery modules (14); - Select (S9) a reuse application for the at least one battery module (14) depending on the corresponding predicted aging state profile.;