Designed for LED flashlights， headlights， electric cigarettes， household electrical appliances， digital devices， RC toys， etc. Specification:SpecificationsType:BatteryBattery Type:Lithium-ionBattery :18650Head Type:Button TopRechargeable:YesProtected:YesVoltage(V):3.7VCapacity:2600mAhBuilt-in Protected Circuit:YesOver Voltage Protection:YesOver-charging Protection:YesOver-discharging Protection:YesShort Circuit Protection:YesOver Cuttent Protection:YesSuitable for:Electronic Cigarette， FlashlightDimension and WeightProduct weight:0.188 kgPackage weight:0.23 kgProduct size (L x W x H):7 x 1.8 x 1.8 cm / 2.75 x 0.71 x 0.71 inchesPackage size (L x W x H):10 x 9 x 5 cm / 3.93 x 3.54 x 1.97 inchesPackage ContentsPackage Contents:4 x Battery