SUPEREX&reg; RPC-S25WIN2 9V Li-ion Ni-MH Rechargeable Battery Charger Color White, Includes 2PCS 9V 350mAh Ni-MH Rechargeable Batteries Charger: Mix charge Ni-MH or Li-ion 9V Battery; polarity detection. Charger output range:8.4V-9.8;polarity detection Ni-MH Battery voltage range8.4V-10.5V Quick and safe,used for smoke alarms,multimeter, professional audio and medical devices Auto alert indication for worse battery pack and bad battery.No memory effect,improved low self discharge.