The solution? A . By setting a custom alert, you can get an instant notification the second your phone hits 100% (or your preferred limit like 80%).

Here is everything you need to know about finding, downloading, and setting up the perfect battery alarm. Why Use a Battery Full Charge Alarm?

A submarine sonar or a digital "Beep-Beep."

Android doesn't always have a built-in "Full Charge" sound setting, but these apps make it easy: