There are already many rechargeable batteries that can save money. However, the use of the rechargeable batteries is not always comfortable. A charger must always be carried along, which can be a nuisance, especially when travelling. A remedy for this is the charging technology integrated into the battery with USB-C input, which opens up the possibility of charging the batteries in several ways.

Nitecore 21700 battery with protection electronics and charging option via USB-C

Built-in PTC to prevent high current surges. Innovative anode design with high temperature resistance. Pressure relief valve activates when temperature rises rapidly. IC protection/PCB with short circuit, overcharge and deep discharge protection. With RoHS and UL certification, incl. worldwide product liability!
Attention! Due to height over 75 mm, not suitable for older torches.

Safety instructions:

Please note that lithium cells may only be used by competent persons.
Incorrect handling or short-circuiting may result in fire or explosion.

Further properties:

Lithium-ion batteries are thermally stable and are not subject to memory effect.
They work on the basis of lithium and are characterised by a high energy density.

Notes:

A special charger is required for charging lithium ion batteries, which charges the batteries according to a special charging procedure. (CCCV = constant current, constant voltage.) The batteries must not be charged above a voltage of 4.2 volts, otherwise there is a risk of fire and explosion. It is advantageous to charge the batteries only up to approx. 4.1 volts, as this significantly increases the service life or the number of charging cycles (possibly up to double). Only lithium ion chargers may be used for charging. However, the cheap chargers sometimes have the disadvantage that they do not switch off safely at the end of the charging process, but continue to charge the batteries with a small charging current, which can be dangerous.

Furthermore, rechargeable batteries and batteries do not belong in household waste! Please dispose of them as prescribed by law at the municipal collection points or in the [usually green] containers provided by retailers.