Automatically detect the battery resistance. Automatically stop after full load. 【Compatibility】 Li-ion: 18650, 18500, 18350, 17670, 17500, 16340, 14500, 10440 3.7V lithium batteries. Li-ion: 18650, 18500, 18350, 17670, 17500, 16340, 14500, 10440 3.7V lithium batteries.