HQRP Rechargeable Battery plus HQRP Screwdriver and HQRP Cleaning Brush; Battery Voltage: 3.7V, Capacity: 800mAh; Li-Ion; Battery size: 49mm x 14mm; 200 Days warranty! Compatible with: Philips Norelco 422203606410 AT880; Compatible With Philips Norelco 422203606410 AT880. Please, notice that to replace the battery it is necessary to disassemble the Shaver. All shavers require soldering to install battery. If You are not sure that can disassemble the Shaver and install the battery correctly, we recommend to ask a specialist Compatible With help.