[ezioamf]

To be clear: 0% would be when current voltage or current mAh level is bellow what the phone needs to operate at maximum capacity.

“Voltage and mAh are two different, but interrelated, things. voltage is a measure of the electrical power a battery can deliver, while mAH (milli-Amp hours) is a measure of how long the battery will maintain usable voltage at a given output current.” https://www.quora.com/How-much-mAh-will-equal-to-1-v