The new 2.0 Ah 18 V Bosch SlimPack battery offers more run time and 2x longer life with unique CoolPack Design technology. The advanced heat conductive housing keeps the battery cooler for long life. The compact size and lightweight make it perfect for professional work overhead. An integrated fuel gauge makes checking charge status quick and easy. And working in cold weather is no issue down to -4°F. The BAT612 is compatible with all Bosch 18 V Lithium-Ion power tools, radios and more.