This app warns the user if the phone’s battery level is below 25% and seems to be draining fast, the app alerts the user with an audio tone. This is quite useful if the phone has been inadvertently been in the Silent mode. The user can change the alert level from a range between 10 to 25%. Tap on the plus and minus button to set the percentage value and click on the Start button to enable the app. This app has been designed to consume very little energy.