If your Android battery drains fast, charges slowly, or shuts down early, this guide shows you how to check battery health, diagnose wear, and confirm if the battery needs replacement.
Quick summary
- Most common signs of battery wear: fast drain, overheating, slow charging, and sudden shutdowns.
- First steps: check built‑in battery stats, review battery usage, and test charging behavior.
- If that fails: use diagnostic codes, manufacturer tools, or third‑party battery health apps.
Step 1 – Check battery usage in Settings
This shows which apps or services are draining your battery.
- Go to Settings → Battery.
- Open Battery usage.
- Look for apps using an unusually high percentage.
Step 2 – Use built‑in battery health tools
Some Android phones include official battery health indicators.
- Samsung: Settings → Battery → Device Care → Battery → Battery status
- Pixel: Settings → Battery → Battery Health
- OnePlus: Settings → Battery → Battery Health
Step 3 – Try battery diagnostic dial codes
Some devices support hidden diagnostic menus.
- Dial: *#*#4636#*#*
- Open Battery Information (if available)
Note: Not all manufacturers support this code.
Step 4 – Use a battery health app
These apps estimate battery wear and charging cycles.
- AccuBattery
- Battery Guru
- Device Info HW
Look for:
- Battery wear percentage
- Estimated capacity vs original capacity
- Charging speed
Step 5 – Test charging behavior
Battery health problems often show during charging.
- Does the phone get hot while charging?
- Does it charge slowly even with a fast charger?
- Does the percentage jump or drop suddenly?
Step 6 – Look for signs of battery degradation
Common symptoms of a worn battery:
- Phone shuts down at 20–40%
- Battery drains extremely fast
- Phone feels warm even when idle
- Battery percentage jumps up or down
- Battery swelling (dangerous)
Step 7 – Factory reset (only if software is suspected)
If battery drain started after an update or app install, a reset may help.
- Go to Settings → System → Reset options.
- Tap Erase all data (factory reset).
Backup your data first.
Step 8 – When to replace the battery
You should replace the battery if:
- Battery health is below 80%
- The phone shuts down unexpectedly
- Charging is extremely slow
- The battery is swollen
Most modern phones require a technician to replace the battery.
FAQ – Android battery health
What is a good battery health percentage?
Anything above 85% is considered healthy.
How long do Android batteries last?
Most last 2–3 years before noticeable wear.
Can battery health be restored?
No — once the battery wears out, it must be replaced.