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Efest IMR 18650 Battery Efest's latest high drain (35a) 18650 battery, with a huge 3000mAh provides excellent power with your ecig Mod. Features a flat top, with quick charging cycle. Features 35amp high drain battery Specially designed for high performance e-cigarette mods Life cycle approx 300 charges Voltage: 3.7v LI-MN Battery Battery Capacity: 3000mAh Improved Voltage Stability For optimal battery performance we highly recommend you keep the battery clean, especially the contacts. Do not leave the battery on charge over night. Do not leave the battery in device if left unused for lengthy periods of time.