ProCORE18V 4.0Ah Battery Pack. The ProCORE18V 4.0Ah Professional is the lightest and most compact battery in the Bosch ProCORE18V range. With optimized size and minimal weight, it features a new generation of cell technology that delivers the same performance as a standard 4.0Ah battery. For added flexibility, it is compatible with all new and existing Bosch Professional 18-volt tools and chargers. To ensure superior heat dissipation from the battery, it also incorporates COOLPACK 2.0 technology. Since heat can damage the cells, COOLPACK 2.0 technology provides an impressive 135% longer battery life compared to standard batteries, allowing for extended operating times. The ProCORE18V 4.0Ah Professional is a lithium-ion battery with a charge level indicator. Box; 1 x ProCORE18V 4.0Ah battery.