3.7 V 750mAh Li-ion battery for LED headlamps Lenser MH3, MH4, MH5 (500985) - Vlad
603040 750mAh Rechargeable Lithium Polymer Battery 3.7V for Laptop Tablet PC Battery - China Shenzhen Lithium Battery, Lipo Battery for Bluetooth Headset | Made-in-China.com