Smart Li-Ion chargers for safe charging of many different cell sizes. Suitable for 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18500, 18650, 18700, 20700, 21700, 22650, 25500 and 26650 3.6V (3.7V) battery-cells. For use with cells with or without built-in protection circuit.