V BIKE Bicycle Headlight Led 1600Lm External Rechargeable Battery

Bicycle Aluminium Head Light: - Light source: 4*CREE XP-G (1600LM) - Function: 100% brightness - 75% brightness - 50% brightness - 25% brightness - Function memory: when reopen,the function will continue the one used by last time - Stage of battery capacity would be indicated by the LED at the back as follows: Green (100-75%); Blue (75-50%); Yellow (50-25%); Red (25-5%); Flashing red (5%) - Battery: 18650*4 Li-Ion battery 7.4V/4400mAh, - Battery lifespan: charge-discharge cycle 500 times, Charging time: 3.5-4 hours - The battery has protection board,it can avoid over charging and discharging. - Running time: 100% brightness------2.2hrs 75% brightness------2.5hrs 50% brightness------3.5hrs 25% brightness------7hrs