A free program for Android, by Creative Photo Lab.

Energy Ring – Battery Indicator is an Android app that shows the battery level on your smartphone’s lock screen. It uses a battery-efficient design that allows it to update itself in the background, even when the app is closed.

How can Energy Ring help me?

It allows you to check your battery level on the lock screen. This can be useful if you need to keep your phone on for a longer period of time. It also allows you to set a custom notification on your lock screen that will notify you when the battery level changes. It does not collect or monitor any data, and it is battery-efficient.