Remarks: Most of original power tool battery packs would not have individual cell voltage monitoring system inside.
When any of cells inside the pack is being over-charged, charger will not stop charging and thus incur risk of explosion.
To ensure safety operation, a cell voltage monitoring mechanism is added to circuitry in our power tool battery packs.
When protection IC detects any of cells in the pack is being over-charged, it will generate a signal to cut off NTC and stop charger from continuing charging the battery pack, therefore avoiding the risk of explosion.
