Battery Health Test
Check your battery without installing anything. When your browser allows it, the test reads the current charge level, whether the device is charging, and the estimated time until it is full or empty. A quick way to confirm a laptop or phone is charging and to keep an eye on the level. Free, no sign-up.
- No app to install
- 100% free
- Nothing is recorded
- No sign-up, no email
- Works on any device
How to use it
- 1
Open the test
The page reads your battery status straight away where the browser supports it. No permission prompt and no install.
- 2
Read the level and status
See the charge as a percentage and whether the device is plugged in and charging or running on battery.
- 3
Watch the time estimate
When available, the test shows the estimated time to full while charging, or to empty while discharging, and updates as the level changes.
When it comes in handy
Confirming a charger works
Plug in and watch the status switch to charging, so you know the cable, adapter and port are doing their job.
Tracking the charge level
Keep an eye on the percentage from a browser tab without digging through system menus.
Checking time to full
See roughly how long until the battery is full before you unplug and head out.
Instant & 100% private — nothing is recorded
The test runs right here in your browser. When it needs your camera or microphone, the feed is shown to you and nothing else: never uploaded, never recorded to a server, never stored. There is no sign-up and no email wall, and most tests keep working with no connection at all.
Frequently asked questions
- Why does the battery test show nothing?
- Not every browser exposes battery information. Several browsers removed the battery feature for privacy reasons, so the test cannot read a level there and will tell you so. On a browser that does support it, a device with no battery, such as a desktop, also shows no reading. There is nothing to fix in either case.
- Can a browser measure battery health or capacity?
- No. Browsers only report the current charge level, the charging state, and rough time estimates. The deeper health figures, like how much capacity the battery has lost over its life, come from the operating system or the manufacturer tools, not from a web page. This test covers the live status, not long-term wear.
- Is the time-to-full estimate accurate?
- It is a guide, not a guarantee. The browser bases it on the recent rate of change, so it shifts as charging speeds up or slows down, and it can read as unknown right after you plug in. Treat it as a rough idea that improves the longer the device charges or discharges steadily.
- Does this test send anything to a server?
- No. The whole test runs in your browser on your own device, and nothing it reads is uploaded, recorded or stored. You can prove it by disconnecting from the internet after the page loads: the test keeps working. There is no sign-up and no account.
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