Bosch GAL 3680 CV Multi-Volt Fast Charger for all Bosch Li-ion batteries from 14.4 to 36 volts. It offers 100% faster charging of the batteries (compared to AL 3640 CV) Active Air Cooling provides longer lifetime of the batteries. The quick charge mode means that a 4.0Ah battery is ready to use with 80% of its capacity after only 25 mins. Specification: Battery Charging Voltage: 14.4-36V. Charge Current: 8 A.