Battery test
Check battery level, charging state and changes over time — no software installation required.
Start testWhat can a browser actually check?
Charge level, charging state and — when the system provides them — time to full charge or estimated discharge time.
Capacity in mAh/Wh, cycle count, temperature, cell wear and true Battery Health %. A normal website cannot access those values.
The test is most useful when it runs for 20–30 minutes or longer under similar usage. Very short tests may show no change because browsers often report battery level in steps.
Battery data is read locally in your browser. ACC64 does not upload the session history.
Common questions
Can ACC64 show battery health as a percentage?
No. Browsers do not expose design capacity and current full-charge capacity, so a Battery Health % would be a guess.
Why does the tester not work in my browser?
Battery Status API is not available in every browser. Chromium-based browsers such as Chrome and Edge currently provide the best support.
Does the test work on phones?
Yes in supported browsers such as Chrome on Android. Safari on iPhone and iPad does not expose the Battery Status API.
Why can the tester show 100% and “plugged in”?
The Battery Status API also uses 100% and “plugged in” as default values when the browser cannot report detailed battery data or when no battery is present. ACC64 marks this reading as limited; unplugging power helps confirm whether the data is real.