· Battery Dimension:Button top size: 2.64*0.7*0.7inch (L*W*H). The 18650 rechargeable battery can be widely applicable for most Types flashlights.· Reliability: Low self-discharge, it still Maintain 80% of capacity after 5 years of non-use. The 3.7V battery has a built-in circuit integrated system that prevents the battery from overcharging, over-discharging, short-circuiting and over-current· Recyclability: The 3200mAh rechargeable battery can be charged with 18650 battery charger. Battery can be recycled, is a good helper of environmental protection· Versatility: 3.7 volt lithium battery is suitable for flashlights, headlamps, cameras, remote controls, fans and other battery-powered devices· After Sale Service: Our team provides 1 year after-sales service, there is no risk to buy our products. If you have any questions about the 3.7V rechargeable battery, please feel free to contact us and we will provide solutions for you.