Starter Set 1 x ProCORE18V 4.0Ah + 1 x ProCORE18V 5.5Ah + GAL 1880 CV, Both batteries featuring a new generation of cell technology. The ProCORE18V 4.0Ah Professional is the lightest and most compact of the Bosch ProCORE18V series. It delivers the same performance as a standard 4.0 Ah battery. The ProCORE18V 5.5Ah Professional as high-performance batter