Rechargeable battery type Li-Ion Battery size 26650Rated voltage 3.6V Capacity 5000mAhFeatures integrated overcharge & discharge protection circuits short-circuit protection especially designed for flashlights innovative structure design, enhanced impact resistance environment friendly flat top tipSpecifications system: lithium-ion, rechargeable nom. voltage: 3.6 V 18 Wh typ. capacity: 5000 mAh IEC: 26650 others: - dimensions: 68.2 x O26.5 mm weight: 98 g package: box remarks: - charge cycles: > 700