... for overcharge, over discharge, overloading Universal mobile phone laptop external battery pack Feature:1. High capacity: With high capacity Li-ion ... protection for overcharge, over discharge, overloading, and short circuit.Specification:Internal Battery type: Li-ion Capacity: 20000mAh(3.7V)/6600mAh(11.1V ... any object into the ventilation holes.12. Recharge the battery at least once every 4 months