Battery Voltage Readout is a free Android app developed by NeoFrontier Technologies. This simple tool is designed for users who need to know the actual battery voltage of their device for debugging purposes or other reasons. The app is useful for monitoring the battery voltage as batteries may suffer overcharge due to various reasons, and sometimes devices indicate the wrong state of charge. A fully charged Lithium-Ion cell will have a voltage of around 4.3 volts under charge, and the voltage should not exceed that limit.

The app is easy to use and provides an accurate voltage reading of your device's battery. It is a reliable tool for developers and tech-savvy users who want to keep an eye on their device's battery health. Additionally, the app recommends other apps for monitoring battery temperature and level with text-to-speech readout alerts. Overall, Battery Voltage Readout is a simple yet effective tool that serves its purpose well.