Bosch GBA18V63 CORE18V Lithium-Ion 6.3 Ah Battery, 18VThe Bosch CORE18 V 6. 3 Ah Battery is the best built battery on the planet and is the core of an end to end product system that offers superior performance than previous generations greater power, more runtime and backward and forward compatibility across the full Bosch 18 V cordless lineup in a compact size. Employing next generation Lithium Ion technology, the CORE18 V produces up to 1,440 Watts of energy, 80% more than previous generation 6. 0 Ah