Phone Battery is a utility tool developed by Tiny Watch for Android devices. This app allows you to check your phone's battery level directly from your smartwatch's widget application. With a simple glance at your smartwatch, you can easily monitor your phone's battery level without having to check your phone.

The app comes in two versions: Free and Premium. With the free version, the service connection will always be kept updated, which can consume battery on both your phone and watch. On the other hand, the Premium version allows you to disconnect the connection after checking your phone's battery on your Galaxy Watch, saving battery on both devices. You can then connect again to check your phone's battery whenever you want.

Overall, Phone Battery is a useful tool for those who want to monitor their phone's battery level without having to constantly check their phone.