Specifications of Battery: Voltage: 12V Capacity: 3500mAh Type: Ni-MH Gross weight: 640g Specifications of Charger: Input voltage: 100-240V Input current: 0.8A Fit Voltage: 1,2-18V Output: 27V /1,5A (1-7 Zellen)/1A (8-15 Zellen) Type: Ni-MH Compatible Battery: FESTOOL 497019, 498336, 498338, 564247, 398338, C12, C12LI, T12+3 Applicable Machines: FESTOOL BPS12C BPS12S BPC12 Tips for Battery: The battery is suggested to be charge and discharge three times first to get the best performance. The battery should keep cool down before charging. The battery should be used at least once a month. Don't let it lay idle for a long time. Tips for Charger: LED light stays red: Being charged LED light stays green: Fully charged LED light flashes red: Poor or reverse connection, high temperature etc.