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Engineered for today's high-drain vapers and e-cigs, Nitecore's 3.7V, 4200mAh 26650A IMR Li-Mn Rechargeable Battery is equipped with flat terminals and has been stripped of the standard over-charge and discharge protections so you can squeeze the most into and out of each charge. Nitecore recommends using IMR-compatible battery chargers to avoid damage.