Powerful 4.0Ah battery with LED battery level indicator. Lithium-Ion technology, which means no memory effect, no self-discharge and always ready for use. PWRCORE 20 system consists of advanced battery and charger technology and KEEPCOOL battery cooling technology which increases runtime and battery lifetime. Also features ACTIVCELL technology that safeguards a maximum performance and optimal battery protection. PWRCORE 20 batteries and chargers are 100% compatible and interchangeable with all SKIL PWRCORE 20 power and garden tools for ultimate flexibility. The PWRJUMP charger only requires 10mins to charge the 4.0Ah battery up to 25% (charges from 0 to 15% in the first 5 minutes and 100% in 50mins). 1 x 20V 4.0Ah Li-Ion Battery 50min Rapid Charger Charges 20V Batteries 1 x 20V 4.0Ah Li-Ion Battery 50min Rapid Charger Charges 20V Batteries