Handy charger with 2 charging points, compatible with batteries with a diameter of 8-19 mm and a length of 30-70 mm, e.g. AA, AAA, AAAA, 10440, 14500, 16340, 18350, 18650, 18700. It recognizes the battery type, charge level and needed an optimum voltage. The built-in 2.5A powerbank will help in a crisis situation. It can automatically detect bad battery and reverse polarity. An additional advantage is the programmed algorithm extending the life of the charged battery. When the battery is fully charged, the device stops operating.
If the situation requires it, you can use a car or wall adapter with USB output. The charger is handy, light and small, so it can easily fit into a backpack or kidney pocket. Thanks to this, you can always have it with you.