· 3.7v battery Size：18650 3.7v rechargeable battery Button Top Type: 67*18*18 mm(2.64*0.71*0.71inch). NOTE: Please confirm the battery size and battery type before purchase.· Large capacity：This 3.7 volt rechargeable battery is with 3200mAh large capacity, supporting stable power for your devices and effectively prevent damage of the devices, the battery can provide you with a long usage time.· Product Features：These 18650 batteries are rechargeable, Designed with multiple protections, such as overcharging, over-discharging and short circuit protection, ensuring safe and reliable use. Easy to use, High quality , durable,Charge up to 800 cycles.· widely compatible：These rechargeable 18650 3.7v rechargeable battery are widely used in various devices, including flashlights, headlamps, path-lights, doorbells and more. NOTE: Please fully charge the products before use.· Warm After-sales Service：All of products have passed strict testing for normal use. If you have any question, please contact us, We will do our best to resolve any problems.