This rechargeable 18650 lithium-ion battery has an integrated micro-USB port which allows the battery to be charged on its own. It fits a variety of NightSearcher torches and head torches and is ideal if you require your light on a daily basis, as you can have one battery in the torch or head torch, and another charging. 
 Key Features:
3.7V 2600mAh rechargeable li-ion battery
Includes a safety control circuit
Charges via integrated micro USB port
5-hour charging time
(Diam.) 18mm x (L)70mm
47g
1-year warranty
 This battery is compatible with:
HT800RX Head Torch
LightWave Motion Sensor Head Torch
Navigator-620R Flashlight
Rechargeable UV365 Flashlight
Tracker 240 Flashlight
Magnum 3500 Flashlight (2x batteries are required for this model)
* The USB charging cable is not supplied with the battery