... .1 V voltage, said in the following, the battery will have no electricity in time, please charge; ... 6.1 V-between 6.8 V, between the battery power is low; Yellow lights up, says voltage in ... machining, anodic oxidation surface treatment.6. Use 4*18650 battery, capacity: 4400 mAh, voltage: 8.4 V,work ... put in safe place. Do not remove the battery, will affect the product performance and dangerous. Bicycle Light ...