The M12 REDLITHIUM 2.0 compact battery pack， Model No. 48-11-2420， features superior pack construction， electronics and performance to deliver more work per charge and more work over pack life. Battery runs cooler and performs in climates below 0 deg F/-18 Deg C. Compact design fits in tight work spaces and reduces user fatigue. Managed by REDLINK intelligence， the battery features overload protection to prevent damaging cordless power tools in heavy-duty situations， and the discharge protection prevents cell damage. The temperature management system and individual cell monitoring help maximize battery life. The M12 lithium-ion battery charger， Model No. 48-59-2401， quickly charges all M12 batteries. Power up M12 REDLITHIUM and M12 lithium-ion batteries in less than an hour. Communicates directly with the battery pack to manage charges and features an easy-to-load design. The charger's slim profile requires little benchtop room， while the pass-through plug conserves valuable outlet space. Monitor battery charges with the on-board indicator light.