Bosch WCBAT612 18-Volt Lithium-Ion 2.0 Ah Wireless Charging Battery Charge new wireless charging batteries anytime and anywhere without ever having to remove from your tool Unique CoolPack design gives the battery a special heat conductive housing that pulls heat away from inside the battery, keeping the battery cooler New high efficiency cells give the WCBAT612 up to a 65 percent more runtime versus 1.5 & 3.0 Ah battery packs Integrated fuel gauge for fast and easy charge status Compatible with all Bosch 18-Volt power tools