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Description The SUNWAYMAN 18650 Lithium Ion Battery is the brand's first ever rechargeable battery. This potent Li-Ion cell delivers a sizable 3.7 Volts of power and sports an impressive capacity of 3400mAh, providing all the energy needed to power your high performance devices. Safety is as much a key feature of the battery as power, featuring PTC Over current Protection as well as a specialized pressure relief valve to prevent damage from sudden temperature increase. The 18650 is capable of being recharged up to 500 times before dropping to 80 percent of its initial capacity, allowing for extensive use before needing replacing. Features Button top made of gold-plated copper for superior conductivity and heat resistance PTC Over current Protection prevents over-discharge that could damage the battery and devices Pressure relief valve on negative end activates if there is a sudden temperature increase Estimated Charge Cycles: 500 cycles Certifications RoHS, CE, PICC Specifications Battery Size: 18650 Battery Chemistry: Lithium-Ion Nominal Voltage: 3.7V Nominal Capacity: 3400 mAh Operating Temperature: -20°C to 60°C (-4°F to 140°F) Size: Length 2.72" (69 mm) x Diameter 0.72" (18.4 mm) Weight: 1.67 oz. (47.6 g) This bundle includes -2 Pack Sunwayman AP-18 3400mAh Protected 18650 Rechargeable Li-ion Batteries with charger -EdisonBright battery carry case