SmartLive 2pcs 3.7V 18650 5000 mAh Rechargeable Li-ion Battery and Single Slot Charger for Flashlight Headlight Battery type:18650 Voltage:3.7V Capacity:5000mAh Dimensions: 6.5 cmLength x 2 cm Diameter Material: Li-ion Charger AC110v-240v 50-60Hz input Output: DC 4.2V 600mA