Lithium Battery Charger

Lithium battery chargerThis Lithium battery charger circuit is dedicated to charge lithium batteries. It uses 2 chips, voltage regulator LM317T and ICL7665 warns microprocessors (μPs) of overvoltage and undervoltage conditions.

Charging is completed 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 should be terminated. The charging system shown is made for multi-cell lithium battery packs of two to six series-connected cells or series/parallel arrangements. It is important that all of the cells built in the pack are at an identical state-of-charge (voltage) before charging. The maximum upper cut-off voltage is 15.6 V (6 x 2.6 V).


Tags: charge lithium batteries ICL7665 ICL7665 circuit lithium battery charger lithium battery packs LM317T circuit

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  1. author

    Javanovich2 years agoReply

    I have 2 cells of lithium ion (US18650GR), which charger I should make?
    How many cells can be charged?

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