... Efficiency 70 Lm/w Operating Power 3.5V Operating Current 700 MAAmbient Temperature -40-55 degree centigreeBattery Cycle Life >500 ... by our company, with so many characteristics such as small, light, long life span, no pollution, maintenance-free, good waterproof, ... inside the fflashlight, which ensures the life span of LED light source.5. Battery without overcharge and over discharge devices. There ...