What is Battery Status?

Battery Status shows your device's current battery level, charging state, and estimated time remaining. It uses the Battery API to give you real-time updates without installing anything.

The tool reads four signals from the Web Battery API: current level as a percentage, whether the device is plugged in, an estimated time to full charge when charging, and an estimated time remaining when on battery. The display updates as soon as the OS reports a change, so plugging the charger in flips the state within a second or two.

How to use

1. Open the tool — your battery level and charging status display automatically.
2. Watch real-time updates as you plug in or unplug your charger.
3. Check estimated time to full charge or time remaining on battery.

When to use

• Checking remaining time before joining a long meeting and deciding whether to grab the charger.
• Verifying that a flaky charging cable is actually delivering power, not just connected.
• Tracking how quickly a laptop drains during heavy work to spot battery degradation over time.

Result

You're about to start a long video call and want to know if your laptop has enough charge. Open Battery Status and see 72% with 2 hours 15 minutes remaining — plenty of time.

FAQ

Why does the tool say my browser isn't supported?

Safari (iOS and macOS) and Firefox removed the Battery Status API for privacy reasons because it can help fingerprint a device. Chrome and Edge on Android, Windows, ChromeOS, and macOS still expose it. Open the page in a Chromium browser to see the readings.

Why is the time-remaining estimate jumping around?

The estimate is the OS dividing current battery level by recent drain rate, so it swings whenever a heavy task starts or stops. A video call might show 1h 30m, then jump to 4h after the call ends. Treat it as a rough indicator, not a stopwatch.

It says Charging but the percentage isn't going up. Is the cable broken?

Possibly. A weak charger (under 5W) running a busy laptop can hold the level steady or even lose ground. Check whether the charger matches the device's required wattage, and whether the cable supports power delivery rather than just data.

Does this work on a desktop computer with no battery?

On a desktop the API usually reports 100% charged and Charging: yes, treating the wall power as a permanent full battery. Some browsers refuse to fire the API on desktops without a real battery and the tool falls back to its not-supported message.

Can the website tell which battery brand or cell health I have?

No. The API only exposes the four values above. Cell chemistry, battery brand, cycle count, and design capacity are not visible to web pages, which is exactly why most browsers locked the API down. For deeper diagnostics, look in the device's OS settings.

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