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Rechargeable Lithium-Ion 18650 Cell 3.7V 1800mAh 3C DIY Charging laptops, Lithium powered Flashlights, Lasers Power Banks and other portable power devices etc (NOT AAA or AA) Power Supply Battery. Flashlights Lighting or other devices that needs 3.7V power Building portable power device needing high energy density and low weight & More! Type: Cylindrical Cells 3.7V 1800mAh Chemistry:Lithium ion Capacity:1800mah Nominal Voltage:3.7V Weight:50g Max Charge Voltage:4.2V Discharge cut-off voltage3.0V Life cycle:-1800 Portable electronic products Digital products .Laptops. Electric toys. Emergency lighting &Led Lighting *Flashlight .Led lights .Emergency lighting . miner's lights.solar power lights . Charging type electric tools. Electric bicycles*Electric bike.Electric Motorcycle.