integrated overcharge & discharge protection circuits short-circuit protection especially designed for high performance flashlights, portable power devices, lighting applications or other devices requiring 3.6 V innovative structure design, enhanced impact resistance environment friendly internal PCB protection prevents voltages outside of 2.5 - 4.25 V large capacity: 3400 mAh genuine Sanyo cell from Japan Product basic info Primary colours: White Additional colours: Black Diameter unit: 18.5 mm Height unit: 68.5 mm Weight unit: 47 g Technical data Battery capacity: 3400 mAh Power supply Number of batteries: 1 Battery voltage rating: 3.6 V Battery composition: Lithium-Ion (Li-ion) Battery IEC size: 18650 (168A, 1865) Pre-charged: Yes Included Case included: No (EN)