integrated overcharge & discharge protection circuits short-circuit protection especially designed for flashlights innovative structure design, enhanced impact resistance environment friendly flat top tip Product basic info Primary colours: Blue Diameter unit: 26.5 mm Height unit: 68.2 mm Weight unit: 95.5 g Technical data Battery capacity: 5200 mAh Power supply Number of batteries: 1 Battery voltage rating: 3.6 V Battery composition: Lithium-Ion (Li-ion) Battery IEC size: 26650 Pre-charged: Yes Included Case included: No (EN)