Battery Guard Pro: Alarm

Battery Guard Pro sounds an alarm when your phone reaches the charging level you choose, so you can unplug it instead of leaving it at 100% all night.

IT ALERTS YOU. IT DOES NOT CONTROL CHARGING.

No app on an ordinary Android phone can stop the flow of power — charging is handled by hardware below the operating system. Any app claiming to cut off your charger is not telling you the truth. Battery Guard Pro does the one thing an app genuinely can do: tell you, loudly and at the right moment, so you can act.

AN ALARM THAT ACTUALLY REACHES YOU

• Full-screen alert that opens over your lock screen and wakes the display
• Works with the screen off and the phone face down
• Any alarm sound on your phone, or a spoken announcement of the level
• Rising volume, vibration and flashlight options
• Stop or snooze with one tap — from the lock screen, the notification, or in the app
• Silent hours, so it stays quiet when you want it to

SET YOUR OWN LIMIT

• Choose any charging limit from 50% to 100%
• Keeping a lithium battery off a constant 100% is widely recommended to reduce long-term wear
• A "still at 100%" reminder if the charger gets left in

MORE THAN ONE ALARM

• Low battery and critical battery warnings
• Battery temperature alert
• Charger disconnected alert — useful when a loose cable stops charging overnight

SEE WHAT YOUR BATTERY IS DOING

• Battery health estimate, labelled honestly by how it was measured
• Wear-over-time chart
• Full charging history, session by session
• Name your chargers and compare how each one performs
• Statistics, including time spent in the healthy 20–80% zone
• Home screen widgets in three sizes, and a quick settings tile
• Export everything as CSV, or share a plain-text health report

BUILT TO KEEP RUNNING

Many phones shut down background apps aggressively, which is why battery alarms so often fail silently. The setup guide walks you to the exact settings screen for your brand — Xiaomi, Oppo, Vivo, Huawei, OnePlus, Samsung, Realme, Infinix and others — and a troubleshooting screen tells you at any time whether the alarm would actually fire, instead of leaving you to find out at 100%.

HONEST ABOUT YOUR DATA

• No account and no sign-in
• Your charging history stays on your phone and is never uploaded
• No analytics and no tracking
• Delete everything from Settings at any time
• Free, supported by ads

NOTHING INVENTED

Every figure comes from what your phone reports. Battery health, cycle count, current and voltage are not available on every device — where yours does not report something, the app says so rather than filling the gap with a guess. A reading you can trust is worth more than a screen full of numbers you cannot.

Battery Guard Pro needs notification permission to show the alarm, and works best when allowed to run in the background. Both are explained during setup, and both can be changed later.