"Percent battery" refers to the amount of energy or power remaining in a device, such as a smartphone or laptop, expressed as a percentage. It shows how much battery life is left before the device needs to be charged again. Full definition
That's not our favorite choice, but at least it enables a fast charge function that brings the notebook to 60 percent battery life in only 49 minutes. (digitaltrends.com)
I've driven over 100 miles and still had 37 % percent battery charge left. (edmunds.com)
With heavy use during the first few days with the phone, we found it had roughly 15 - 20 percent battery left at bed time. (pocket-lint.com)