The CORE18V 8 Ah High Power Battery delivers 50% more runtime and over 75% more power than the CORE18V 4 Ah battery, powering high-demand applications. The GBA18V80 features two layers of enhanced 21700 cells for greater battery efficiency. The battery has CoolPack™ 2.0 technology, which cools the battery faster and helps provide longer lifetime compared to Bosch 18V batteries without CoolPack™ 2.0. It weighs only 2.14 lbs., for the ideal balance of size, weight and power. It includes a charge status indicator with high resolution for clear visibility. This battery is engineered for 18V and it's compatible with Bosch 18V tools.