ChargeSage : Battery Monitor

Battery monitor for charging speed, battery health and live charging animations.

ChargeSage is an honest battery monitor for Android. Plug in and see your real charging speed in live watts and amps, check if fast charging is really working, measure battery health and capacity in mAh, watch temperature and voltage, and know the exact time to full. Set a charge alarm to stop at 80%, and turn your lock screen into a live charging animation.

Most battery apps show you a number. ChargeSage tells you whether that number is any good.


⚡ CHARGING SPEED & FAST CHARGING CHECK

• Live watts, charging current in mA, voltage and temperature, sampled every 1, 2 or 5 seconds
• Fast charging check, plus charger detection: AC, USB port, wireless or dock, with its speed class
• Time to full, built from your own charging curve instead of a generic formula
• Test chargers, cables and power banks: plug each one in and see which is really faster
• Why a "45 W" charger reads lower at the battery


📈 IS THIS CHARGE ACTUALLY FAST?

Every charge is scored against your own history, never against a marketing number:

• "Slower than 89% of your charges": a real percentile from your own sessions
• Heat and taper are named separately, because a phone easing off at 82% is physics, not a fault
• If a charger you already own is faster, ChargeSage shows how much time it would have saved


🔋 BATTERY HEALTH & CAPACITY

• Real battery capacity in mAh, measured from the coulomb counter across clean charge windows
• Battery health trend over time, with a degradation projection
• Cycle count on devices that report it (Android 14+)
• Every figure has an error range and a confidence label. Nothing is labelled MEASURED until it genuinely has been


⏰ CHARGE ALARM: STOP AT 80%

• Charge limit alarm, anywhere from 50% to 100%. 80% is the usual advice for long battery life
• Low battery alarm, 5% to 50%
• Battery temperature alarm, 30°C to 50°C
• Rings on the alarm stream, so it still sounds on silent


✨ CHARGING ANIMATION ON YOUR LOCK SCREEN

Plug in and your phone becomes a live charging screen, even on the lock screen:

• 16 hand-drawn charging animations, each one driven by your real charging speed
• 6 clock faces, 3 layouts, dimming and an auto-hide timer
• AMOLED true-black, with no wake lock


📊 BATTERY USAGE & HISTORY

• Every charge and discharge session, with a scrubbable charging curve
• Day and week battery usage breakdowns
• Screen time and per-app battery drain (optional, needs Usage access)
• Export to CSV or JSON any time, or clear history in one tap


🧩 WIDGETS & THEMES

• 4 home-screen widgets: battery gauge, live session, health and slim bar
• 8 accent colours that theme the whole app, plus Material You on Android 12+


🔒 PRIVATE AND HONEST

• Your battery history stays on your phone. It is never uploaded
• No root needed
• It does not "boost", "optimise" or "calibrate" your battery. No app can, and any app claiming to is guessing
• It does not kill background apps


PERMISSIONS

• Notifications: the monitoring notification and your alarms
• Foreground service: keeps measuring overnight with the screen off
• Display over other apps (optional): shows the charging screen the moment you plug in
• Usage access (optional): powers screen time and per-app drain
• Ignore battery optimisation (optional): keeps monitoring alive overnight

Decline any of them and everything else keeps working.


ABOUT ACCURACY

ChargeSage can only be as accurate as the sensors your phone exposes. ChargeSage corrects the quirks it can identify and tells you when it is unsure. It is a measuring tool: do not use it for warranty, resale or insurance claims.

Every feature is free. Nothing is locked.

Privacy Policy: https://xypherlabsdev.github.io/ChargingSage-Privacy-Policy/
Terms: https://xypherlabsdev.github.io/ChargingSage-Terms-services/
Questions: xypherlabs.dev@gmail.com