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Please check the size before buying. SIZE: (2.5 x .75) inch. 18650 Li-ion battery designed for a wide range of electronic devices. It delivers reliable power and a long lifespan, making it an excellent choice for DIY projects, flashlights, power banks, and other compatible electronics. Key Features: High Capacity: With a 2000mAh rating, this battery offers extended runtime for your devices. This means you can use your gadgets for longer periods before needing to recharge. Standard Voltage: The nominal voltage of 3.7V ensures compatibility with most devices that use 18650 cells. This voltage is standard for lithium-ion technology, providing stable power output. Rechargeable: This battery can be recharged multiple times, significantly reducing waste and the need for disposable batteries. Important Safety and Usage Information: Charge properly: Use a dedicated charger for batteries to prevent overcharging. Do not puncture, disassemble, or short-circuit: Mishandling can lead to fire or explosion. Store in a safe place: Keep batteries away from high temperatures and direct sunlight. Dispose of responsibly: Recycle old or damaged batteries at a designated collection center.