... than 100,000 hours of bulb longevity. 3, the circuit: using a small dimming circuits, (5 files) with anti-reverse, over discharge ... 37.0mm diameter 16.5mm, overcharge protection, overcharge 4.2V, voltage : 2.75V, battery cycle life of more than 500 ; ... of 600mA,Reverse battery protection Battery overcharge protection, and constant voltage charging process!Travel plug for carrying! after-sale service ...