... the safety, no pollution, no memory lithium-ion battery, and the capacity is up to 2400mAH; KM- ... the safety, no pollution, no memory lithium-ion battery, and the capacity is up to 2400mAH;2. lithium ... -ion battery built-in overcharge & over discharge protection circuit; ... like this .Cautions:For service life of the battery, when the ray of the head light is ...