Lithium charger circuit

  
Charging is accomplished with a constant current of 60 mA for AA cells to a cutoff voltage of 2.4 V per cell at which point the charge must be terminated. The charging system shown is designed for multi-cell battery packs of 2 to 6 series-connected cells or series/parallel arrangements. It is essential that all cells assembled in the pack be at an identical state-of-charge (voltage) prior to charging.
Lithium charger circuit - schematic

The maximum upper cut-off voltage is 15.6 volts (6 ? 2.6 V).




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