This extremely powerful Li-ion battery with 3.7V and 35.52 Wh is fully charged in 5 ½ hours. Perfect as a replacement battery for emergencies or as a spare or back-up battery.

LEDLenser 2x 21700 Rechargeable Battery Pack for H15R/H19R Specifications:

Compatible with: H15R Core, H15R Work, H19R Core, H19R Signature
Length (mm): 45
Width (mm): 22
Height (mm): 76
Weight (g): 150
Material: Steel housing + PVC
Battery Type: Li-ion
Battery Description: 2 x 21700 Battery Pack 3.7V (Batteries are combined as one pack)
Total battery voltage [V]: 7.4
Total battery capacity [mAh]: 4800
Total battery energy [Wh]: 35.52
Rechargeable: Yes
Charging time [min]: 330