The invention provides systems and methods for charging an electrochemical device, such as a secondary 
electrochemical cell. Charging systems and methods of some embodiments provide charging parameters, such as charging 
voltage and charging current, that vary in a preselected manner as a function of time so as to enhance the overall device performance (e.g., specific capacity, 
discharge rate, etc.) 
cycling properties and useful lifetime of a secondary 
electrochemical cell. Charging systems and methods of some embodiments provide charging parameters, such as time varying charging voltages and charging currents, that take into consideration important 
electrochemical cell properties that 
impact device performance, 
cycling and lifetime, such as the 
state of health of an electrochemical 
cell, and / or the health and / or composition of specific 
system components such as 
anode, 
cathode, and 
electrolyte and / or the cycle history of the electrochemical 
cell (e.g., cycle number, etc.).