Simply ingenious: This battery comes with its own USB-C charging socket. This makes an extra charger superfluous! Simply connect it to a USB port (e.g. in the car or mobile phone charger) with the USB cable supplied – that\’s all. An LED built into the battery even informs you about the current charging status. Of course, the NEXTORCH 21700 USB Li-Ion battery with 5000 mAh is triple protected, i.e. it has \”IC Protection\”, a PCB with short-circuit, overcharge and deep discharge protection. The NEXTORCH 21700 USB Li-Ion battery with 5000 mAh is suitable for all devices and especially torches that use a 21700 battery. Nextorch replacement Rechargeable Lithium Li-ion battery, Usb type C Direct charge. 21700, 5000mAh, 3.6v, 18wh overcharge protection included cycle life > 500 Size: 76.3×31.5 weight: 80g operating temp: 20-60 Deg C