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With increased use of Lithium-Ion (Li-ion) batteries in military and space applications, it is important to understand individual cell performance. The performance of the individual cells in a four cell, 45 ampere hour (Ah) Li-ion battery was obtained through repeated cycle testing. To show the effects of cell equalization, the battery was subjected to multiple charging cycles with and without cell equalization. Initially, the battery was subjected to 15 cycles of bulk charge, cell equalization and battery discharge. These cycles were followed by 700 cycles of bulk charge and battery discharge. Battery testing was completed with 187 cycles of bulk charge, cell equalization and battery discharge.

EaglePicher's state-of-the-art MSD portable and bench top test systems can service any secondary (rechargeable) battery chemistry with nominal battery voltages from 1 to 36 volts and charge/discharge currents ranging from 0.02 to 25/50 amperes for the portable system and 0.02 to 70 amperes for the bench top system. All MSD systems can store up to 80 battery test profiles. Test data is serially streamed to a PC for archiving and analysis. System battery test and maintenance profiles can be modified through a PC interface. Profile manipulation allows the MSD user to create an infinite number of battery test profile variations. PC profile generation allows the MSD user to input battery service termination criteria offering unmatched flexibility and provides cost effective upgrades. Termination criteria include end-of-charge voltages, currents, delta temperatures and negative voltage slopes, and time.