Bosch's battery starter set contains a charger and three batteries with a battery voltage of 18 volts. Compared to conventional manufacturers, thanks to the Air Cooling System, which protects the battery from overheating, the lifespan is extended by up to 135%. The batteries are extremely powerful thanks to an optimal generation of cells in combination with the Bosch-own competence at batteries. Likewise, the batteries with all Bosch Professional 18V tools and chargers are compatible thanks to the flexible power system. % compatible with all Bosch Professional 18V tools & chargers, durable with up to 135 % longer lifetime thanks to Coolpack 2.0 technology , charger GAL 1880CV , battery charging: 14.4-18 V, charging current: 8 a, 50 % faster charging of the battery (Compared to AL 1860 CV), Active Air Cooling for a longer lifespan of the battery, loading time with battery capacity 1.5 AH (80 % / 100 %): approx. 10 /25 min, charging time with battery capacity 2.0 AH (80 % / 100 %) : Approx. 15/30 min, loading time with battery capacity 3.0 Ah (80 % / 100 %): approx. 20 /35 min, loading time with battery capacity 4.0 AH (80 % / 100 %): approx. 25 /35 min, charging time at Battery capacity 5.0 AH (80 % / 100 %): approx. 30/45 min, loading time with battery capacity 6.0 AH (80 % / 100 %): approx. 35 /55 min, loading time for battery capacity 6.3 AH (80 % / 100 %) : Approx. 41/55 min , You can find more information about this product group here