Product Dimensions: 67*18*18mm/2.64*0.71*0.71inch. NOTE: These are BUTTON TOP 18650 batteries with metal tip on the positive end. Please confirm the battery size and battery type before purchase | Wide Compatibility: Widely used for LED flashlights, solar lights, racing, game controller, emergency lights, portable devices, headlamps, toys, remote controls, doorbells and other electronic devices. | Advanced Smart Cell Technology: The built-in intelligent battery cell ensures efficient power management and longer-lasting usage. | Safety Certifications: Trust in the quality and safety of our battery, certified by CE, FCC, PSE, ROHS, and UL standards. | Protective Mechanism: Built-in protection features safeguard your device from overcharging, overheating, and short circuits.