26650 Battery, SUNKINGDOM&trade; 4 Pack 26650 Rechargeable Battery 3.7V 5000mAh High Powerful Flashlight Lithium Battery with Battery Storage Hard Case Box for LED Flashlight, Headlamps Can be charged over 500times Internal Resistance&lt;35m Charging0.5CDischarging1C Travel charger folds up for easy transport Provides continuous power and great for use in your household devices and other portable electronics Environmental design, over current protection, over charge and discharge protection. 24 hours customer service for every purchasing from SUNKINGDOM