Nitecore NL1834R 18650 (3400mAh)

The Nitecore NL1834R belongs to the new generation of "smart" 18650 batteries: alongside 3400 mAh of capacity, it packs a USB-C charging port directly under its protective cap. No more carrying an external charger: a simple USB-C cable, plugged into a computer, a wall adapter or a power bank, is all it takes to recharge it, wherever you are.

In this familiar 18650 format (0.73 in (18.5 mm) diameter, 2.80 in (71 mm) long, 1.76 oz (50 g)), the cell delivers a nominal voltage of 3.6 to 3.7V for a total energy of 12.58 Wh, and supports a continuous discharge of up to 5A, plenty to power demanding flashlights and headlamps. A built-in indicator LED near the USB-C port shows charge status (red while charging, green once full), handy for checking the battery at a glance without removing it from the device.

The Button Top format (raised positive terminal) and the built-in protection circuit (PCB) make it compatible with the many flashlights that require a protected cell, while actively guarding against overcharge, over-discharge and short circuits. A pressure relief valve and a microporous barrier round out the safety features, an important point on such an energy-dense format.

Rated for more than 500 charge and discharge cycles, the NL1834R is aimed at flashlight, headlamp and other 18650-device users who want to simplify their daily routine: no more removing the cell to place it on a dedicated charger, just plug a USB-C cable straight into it. It remains compatible with standard external chargers if you prefer to recharge several cells at once. A safe bet from Nitecore, a brand recognized for the reliability of its cells and built-in electronics.