ON THE WAY&Acirc;US Plug New 16340 Rechargeable Battery (4 Pcs) 1000mAh 3.7V with Digital Battery Charger Voltage: 3.7v Capacity: 1000mAh Model:16340 The voltage of full charge & empty condition is 4.2v & 2.75v respectively Perfect for Flashlight, Photo camera.Warm tips: Before purchase, please make sure the battery voltage corresponds with voltage mark on your device