... 6.1V vltage, said in the following, the battery will have no electricity in time, please charge ... 6.1V between 6.8V, between the battery is low.*Yellow lights up,says voltage in ... , anodic oxidation surface treatment.6. Used 4*18650 battery pack, capacity: 4400mAh, voltage:8.4V, work ... Do not remove the battery, wiil affect the prodcuts performance and dangerous. Pictures: TrustFire TR-D003 Bicycle Light ...