Battery Sound Alarm is a handy utility tool designed for Android devices that notifies users with a custom song when their battery is fully charged. The app allows users to select a reminder song, manage battery alert levels, and control volume settings. It operates seamlessly in the background, automatically notifying users upon charging completion without needing to keep the app open. The app also features vibration alerts and a 'Do Not Disturb' mode, ensuring users are informed without being disturbed during important tasks.

In addition to its core functions, Battery Sound Alarm provides a battery level display at the top of the screen, low battery alerts, and battery status warnings. Users can also access charge history and utilize a battery widget for quick monitoring. The app requires no essential permissions, while optional storage access allows users to set music files as reminder tones. Overall, Battery Sound Alarm is an effective solution for managing battery notifications and enhancing charging experiences.