Android battery health check
Battery drains fast or the phone shuts down early? See how much of its original capacity the battery still holds and if it needs a new one. We guide you step by step. Nothing to install and nothing is uploaded.
How it works
Answer one question at a time, on the phone or on a computer with a USB cable.
It ends with the battery health in percent and if the battery needs replacing.
Check this phone on the phone itself
Recommended. We show you where the phone keeps its battery health.
Check it on the phone itself
Recommended. Scan the code with the phone's camera or type the short link.
nopowerfix.com/android/battery-health
What turning on USB debugging means
- While it's on and you tap Allow, a computer can do a lot more: read files, install apps, run commands.
- This page only reads the battery.
- Nothing is sent or stored. It works offline, and the result lists every command it ran.
- Turn USB debugging off afterwards. We show you how.
Which brand is the phone?
Tap it to go on.
Which brand?
This browser can't reach a phone over USB
Open this page in Chrome or Edge on a computer, or in Chrome on Android.
Is USB debugging on, on the phone?
It's a switch the phone keeps hidden. Without it, the phone can't be read over a cable.
Turn on USB debugging
Plug the phone in and tap Connect
- Use a data cable, and keep the phone unlocked.
- Use an OTG adapter or a USB-C to USB-C cable. Keep both phones unlocked.
The phone isn't in the list?
- USB debugging is off, or the cable only charges. Try another cable or port.
- Close adb, Android Studio, phone managers and scrcpy on this computer. A running
adb.exeholds the phone. - Windows: if the phone appears but won't connect, install the phone maker's USB driver or Google's USB driver.
Tap Allow on the phone
Allow USB debugging?
The computer's RSA key fingerprint is:
3A:9F:…:C2
Always allow from this computer
CancelAllow
Tick Always allow if this is your own computer, then tap Allow. This page moves on by itself.
Waiting for the phone…
Nothing on the phone? Unlock it, or unplug and plug in again.
Reading the battery…
Now turn USB debugging off
The phone is disconnected; you can unplug it.
If you like, tap Revoke USB debugging authorizations in Developer options first: the phone then forgets every computer it allowed.
Where your phone shows it
-Battery level, not health
What does it show?
Read it over a cable instead
Many phones made before 2024 don't show battery health. The phone still knows it; a computer or another Android phone can read it over USB.
Open this page on a computer
Go to nopowerfix.com/android/battery-health in Chrome or Edge on a Windows, Mac, Linux or ChromeOS computer and plug the phone in. The page walks you through the rest.
How we judge battery health
80 % is the line phone makers use for a worn battery.
More detail
Apple, Google and Samsung rate their batteries to keep about 80 % of the original capacity after a set number of full charge cycles. The EU rules for phones sold from June 2025 ask for at least 80 % after 800 cycles. Below that the phone runs out sooner and may shut down under load. A battery that is swollen, hot or leaking needs replacing whatever the number says.
What each way can read
| Way | Needs | Reads |
|---|---|---|
| On the phone itself | Any browser | What the phone's own Settings show, typed in by you. |
| Computer + USB cable | Chrome or Edge, USB debugging on the phone | Health %, full-charge and design capacity, cycles, temperature, voltage, the phone's own health flag. Anything a phone doesn't share is shown as "not available on this phone". |
| Another phone + OTG cable | Chrome on a second Android phone | The same as with a computer. |
Privacy
The check only reads. Nothing is changed on the phone, sent or stored.
Free, private, built to keep devices alive
In 15 years at the bench we saw too many good devices go in the bin because nobody found the real fault. Our Hardware Specialist and Senior Repair Technicians built these tools so more devices get fixed instead of thrown away. If they helped you, a review helps the next person find them, and your support pays for the next fix.
> goal: Less e-waste · Greener Earth
We find the real fault before parts are replaced, so fewer working batteries, boards and devices end up as e-waste.