PROTECTED 3400mAh Panasonic 18650 li-ion 3.7V battery by Orbtronic - The latest Panasonic NCR18650B 3400mAh cell is used to build 18650 3400mAh Orbtronic protected battery. * Protection: Over-current (Activated @ 10A-12A), Over-charge (Activated @ 4.35V) - Over-discharge (Activated @ 2.5V) - Over-temp. and DUAL short circuit protection (External, and Internal).Protection circuit designed by Seiko. ICs made in Japan. * Best battery for High-Power flashlight users, or for anyone who is looking for the longest run time possible. This is the largest REAL capacity available on US market. * Very safe to operate, This 18650 Li-ion protected battery will auto. disconnect itself from el. circuit in case of: Short circuit - Extreme temperature, Abnormally high current , Over-voltage - Over-charge, Over discharge. * Battery cell: Panasonic NCR18650B, Capacity (Ah): 3.4 Ah (3400mAh), Charging Voltage (V): 4.2 V, Energy (Wh): 12.2 Wh, Energy Density (Wh/L): 730 Wh/L, Nominal Voltage (V): 3.6V - 3.7V, Weight (g): 46 g, Diameter (mm): 18.6 mm (+/- 0.03), Length (mm): 68.9 mm (+/- 0.03) -- Top Button (Positive) made of Nickel (Ni) - Negative made of Copper (Cu) for an ideal conductivity, and durability.