Laptop Battery Test
PowerFree laptop battery test in your browser — charge level, charging status and time estimates. Nothing is uploaded.
Everything runs in your browser. Nothing is uploaded.How to use the Laptop Battery Test online
- 01 The gauge shows your current charge level instantly.
- 02 The bolt icon means the device is charging.
- 03 Plugged in, watch the estimated time to full.
- 04 On battery, watch the estimated time to empty.
- 05 If you see the 'not supported' card, switch to a Chromium browser.
Common problems & fixes
- No reading in FirefoxFirefox removed the Battery API. Use Chrome or Edge, or check the OS battery indicator.
- Safari shows nothingSafari doesn't implement the Battery API. Use Chrome, or click the menu-bar battery for details.
- Estimates missingTime-to-full/empty depends on the OS exposing it; the level usually still reads.
Related checks
While you are here, you can also review DPR, GPU, and viewport details, run a quick frame-rate sanity check, or open the camera and confirm resolution and frame rate.
Working through the whole category? Browse all system tests in one place.
Frequently asked questions
On supported Chromium browsers, this laptop battery test online (a laptop battery checker) reads the Battery Status API (level, charging, time estimates). Safari and Firefox often lack or restrict this API.
The gauge shows your current charge percentage when the browser exposes the Battery Status API, along with charging state and time estimates where available.
High screen brightness, background apps, and aging cells are the usual causes — this page only shows live percentage and charging state, not wear. On Windows run powercfg /batteryreport; on macOS open System Settings → Battery → Battery Health.
Confirm the cable and charger first. This battery checker shows Charging vs Discharging when the browser exposes it; if it stays on battery while plugged in, the OS or charger path is the problem, not this page.
No browser exposes battery wear percentage or cycle count — it is blocked for privacy. Use the OS tools above; this laptop battery test is charge level only.
The Battery Status API was removed from Firefox and Safari over privacy concerns. Chromium browsers still support it.
No. It is read locally only when the API is available, and never leaves your device.