A free program for Android, by Android App Nest.

Battery Voice Alert! is a free Android app that allows you to improve and protect your mobile phone’s overall battery performance.

It offers a lot of features such as pre-charge alert options and warnings that can help you become notified on how already high the charging status, temperature status, and health status are. It stimulates a beep sound that is not too annoying every time a battery level is completed, so it won’t disturb you. You can also enable and disable the settings according to your liking.

The app also gives you helpful tips that improve your battery’s performance.

Fun fact: You can also customize themes, background colors, and styles!