Battery Charge Limit [ROOT] is a free utility and tool Android application developed by SL/\SH. As the name suggests, this app limits the battery charge on a rooted device. It works by stopping the charging process once the device reaches the maximum threshold and resumes charging when the battery level falls below the threshold.

This app is open-source, and the source code is available on GitHub. However, it's important to note that this app requires ROOT access to work. If your device is not rooted, this app won't work. Also, not all devices are supported, so it's recommended to check the XDA forum link for more information on rooting devices.

Overall, Battery Charge Limit [ROOT] is a useful app for those who want to extend their battery life by limiting the charging process. However, it's not recommended for those who are not familiar with rooting their devices or don't want to take the risk of unintended behavior.