The Makita 18V compact Lithium-Ion battery charges faster and works longer than standard 18V compact Lithium-Ion batteries, giving you and your Makita cordless tools unmatched performance and productivity in a compact size. The Makita 2.0 Ah battery delivers up to 50% more run time per charge than the Makita BL1815 18V compact battery, with a fast charge time of only 25 minutes for increased efficiency. Makita 18V Lithium-Ion batteries resist self-discharge so they’re ready for use even after long periods of storage. The Makita Rapid Optimum Charger (sold separately) is a smart-charging system that communicates with the battery during the charging process to monitor current, voltage and temperature. STAR Protection is communication technology that allows the tool and battery to exchange data in real time and monitor conditions during use to protect against overloading, over-discharging and overheating.