Battery Status
See your device battery level and charging status, live in your browser.
How to use this tool
- Open this page — it runs instantly in your browser, no signup or install.
- Allow any permission prompt if asked; everything stays on your device.
- Use the on-screen controls — results update live.
See your device battery level and charging status, live in your browser.
How it works
This tool uses the Battery Status API (navigator.getBattery()) to read your device's current battery charge level, whether the device is charging, and the estimated time remaining to full charge or to discharge. All readings are live and update automatically as your battery state changes.
Battery level is expressed as a percentage. Charging time shows how many minutes until the battery reaches 100%; discharging time shows how many minutes of runtime remain at the current usage rate. If the browser cannot estimate these times, they display as 'Unknown'.
This tool is useful on laptops and mobile devices when you want a quick battery check without leaving your browser, or when system notifications are disabled.
Worked example
Check battery level and time to full charge
- Connect your laptop to power.
- Open the tool in your browser.
- Read the 'Level' field for the current percentage.
- Read the 'Charging Time' field for the estimated minutes to full.
The tool shows 64% charged, plugged in, with approximately 47 minutes to a full charge.
Common mistakes to avoid
- Expecting this to work in Firefox or Safari — those browsers do not implement the Battery Status API.
- Treating the discharge estimate as precise — it fluctuates with CPU and screen load and is best read during steady-state usage.
- Keeping this tab open to monitor long-term battery health — the API provides snapshots, not historical tracking.
Key terms
- Battery Status API
- A browser API that exposes the device battery level and charging state to web pages through the navigator.getBattery() method.
- Discharge time
- The browser's estimate of how many seconds (converted to minutes here) until the battery is fully depleted at the current power draw.
- Charging time
- The estimated seconds until the battery reaches 100% while connected to power.
Frequently asked questions
- The page shows 'Not supported' — why?
- The Battery Status API is supported in Chrome and some Chromium-based browsers, but Firefox removed it for privacy reasons and Safari never implemented it.
- Why is the discharge time 'Unknown'?
- The browser calculates discharge time based on current power draw. If usage is too variable or the system cannot provide an estimate, it returns Infinity, shown here as Unknown.
- Can this drain my battery faster?
- No. The tool only reads values provided by the OS; it does not perform any power-intensive operations.