Battery Alarm: Extend Lifespan
Synkn Tools
Battery full & low alarm. Stop overcharging with custom limits. No ads.
- Downloads
- 1K+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Nov 4
- 2026 · v1.0.0
Screenshots
About Battery Alarm: Extend Lifespan
Battery Alarm: Extend Lifespan is a simple battery full alarm and low battery alert for Android. Set your own charge limits and get a loud alarm when your battery reaches them, so you can unplug before overcharging and plug in before it runs too low.
Lithium-ion batteries generally wear more slowly when they are kept between about 20% and 80%. Staying at full charge for long periods, running very low and heat all add stress. Battery Alarm helps you stay in that gentler range. It does not stop charging by itself: it alerts you, and you unplug or plug in your charger.
DUAL ALARM PROTECTION & CUSTOM LIMITS
• Full charge alert (high limit): Choose a limit between 60% and 100% (80% recommended). When your phone reaches it while charging, a looping alarm and high-priority notification sound right away.
• Low battery alert (low limit): Choose a limit between 10% and 50% (20% recommended). Get a clear reminder when your unplugged battery drops low.
• Easy slider controls: Adjust both limits with simple touch sliders.
LIGHTWEIGHT BACKGROUND MONITORING
• Background service: Watches your charge level while your screen is locked or idle, using minimal system resources.
• Real-time battery insights: See charge status, voltage, temperature and battery health at a glance.
• Custom alerts: Pick alarm tones, set snooze intervals and adjust volume.
100% OFFLINE, NO ADS, PRIVACY FIRST
• Works fully offline: No internet, Wi-Fi or mobile data needed.
• No ads and no extra downloads: Everything is ready right after install.
• No account, no data collected: Battery Alarm collects no personal data and shares nothing with third parties.
KEEPING ALERTS RELIABLE
Some phones stop background apps to save power. If alerts stop, open your phone's battery settings, find Battery Alarm, set its battery usage to Unrestricted (or turn off battery optimization for it) and keep notifications allowed. Need help? Email [email protected].
PERMISSIONS
• Notifications: Used only to show alerts when your charge limits are reached.
• Foreground service: Used to monitor your battery while the screen is locked or idle.
Download Battery Alarm today and take control of your charging habits.
Lithium-ion batteries generally wear more slowly when they are kept between about 20% and 80%. Staying at full charge for long periods, running very low and heat all add stress. Battery Alarm helps you stay in that gentler range. It does not stop charging by itself: it alerts you, and you unplug or plug in your charger.
DUAL ALARM PROTECTION & CUSTOM LIMITS
• Full charge alert (high limit): Choose a limit between 60% and 100% (80% recommended). When your phone reaches it while charging, a looping alarm and high-priority notification sound right away.
• Low battery alert (low limit): Choose a limit between 10% and 50% (20% recommended). Get a clear reminder when your unplugged battery drops low.
• Easy slider controls: Adjust both limits with simple touch sliders.
LIGHTWEIGHT BACKGROUND MONITORING
• Background service: Watches your charge level while your screen is locked or idle, using minimal system resources.
• Real-time battery insights: See charge status, voltage, temperature and battery health at a glance.
• Custom alerts: Pick alarm tones, set snooze intervals and adjust volume.
100% OFFLINE, NO ADS, PRIVACY FIRST
• Works fully offline: No internet, Wi-Fi or mobile data needed.
• No ads and no extra downloads: Everything is ready right after install.
• No account, no data collected: Battery Alarm collects no personal data and shares nothing with third parties.
KEEPING ALERTS RELIABLE
Some phones stop background apps to save power. If alerts stop, open your phone's battery settings, find Battery Alarm, set its battery usage to Unrestricted (or turn off battery optimization for it) and keep notifications allowed. Need help? Email [email protected].
PERMISSIONS
• Notifications: Used only to show alerts when your charge limits are reached.
• Foreground service: Used to monitor your battery while the screen is locked or idle.
Download Battery Alarm today and take control of your charging habits.
What’s new
Version 1.0.0 · Updated November 4, 2026
New: Travel Mode • Skip Charge Alarm: charge to 100% without interruptions. It turns off automatically when you unplug, so your normal limits are back next time. • Alert at 100%: optionally get one alarm when your battery is fully charged. Lighter on battery • Smarter background checks use far less power, while alarms still ring on time. Other improvements and fixes.
User reviews
Excellent battery alarm app with a clean simple interface, beautiful design and absolutely no privacy concerns. Perfect!
pretty good app simple and no ads
+Superb and nice app.
The great and nice app.please select a name for your app.thanks a lot
I have tried many battery alarms, and this is by far the best battery alarm period! It has a perfect simple interface with everything you need and nothing unrelated to simply telling you when the battery reaches a certain limit either high or low. No ads, nothing invasive, uses little resources and absolutely perfec...
excellent
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|---|---|---|---|
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