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 and low weight & More! Type: Cylindrical Cells 3.7V 1800mAh: Lithium ion Capacity:1800mah