Auto-Empty System Battery Pack

Compatible with:

BU3521, BU3120, BU3523 (Because of generational update to BU3120 please remove the battery pack and check the rating voltage and battery pack model number. If the rating voltage is 18V or the battery pack model is XBATR525SL or BATR525SLN, then XBTR625KSLN is NOT compatible. If the rating voltage is 21.6V or the battery pack model is XBTR625KSLN, then XBTR625KSLN IS compatible.)