How to use this tool
- 1Open this page on the phone itself.
- 2Battery level and state appear automatically.
- 3Plug or unplug the charger and watch values update live.
About this test
This tool reads battery status through the browser and shows the current level, whether the device is charging, and estimated time to full charge or to empty.
It's a quick real-time consumption overview. To evaluate wear (capacity lost over time), use the Battery Health Calculator. Some browsers removed this API for privacy.
Privacy: this tool runs entirely in your browser. No image, audio or device data is recorded or sent to any server.
Frequently asked questions
Battery status doesn't show.
Some browsers (Firefox, Safari) disabled battery reading. Use Google Chrome on Android to see the data.
The time estimate doesn't appear.
Not every device reports charge/discharge time to the browser. In that case only level and charging state are shown.