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Battery API Checker

Check Battery API.

API: battery
Click the button to test the API.

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What is Battery Api Checker

The Battery API Checker queries the browser's Battery Status API and displays the current charging state, battery level percentage, and estimated charging or discharging times. The Battery API (navigator.getBattery()) returns a BatteryManager object that provides real-time information about the device's power source. This is useful for building adaptive web experiences — for example, a video streaming app might reduce bitrate when the battery is low, or a navigation app might warn the user before starting a long trip. The tool does not modify any battery settings or send data to any server — it reads status information that the browser already tracks.

How to Use Battery Api Checker

  1. Step 1: Navigate to the Battery API Checker page. The page shows a test button and output area.
  2. Step 2: Click the **Test API** button. The tool calls navigator.getBattery() and reads the battery status.
  3. Step 3: If supported, the output displays charging state (true/false), battery level (percentage), and estimated times.
  4. Step 4: If the Battery API is not supported (iOS Safari, some desktop browsers), the output indicates the API is unavailable.
  5. Step 5: On Android Chrome, the tool shows real-time battery data that updates as you charge or discharge the device.

Why Use Battery Api Checker

Developers building progressive web apps, streaming platforms, or resource-intensive web applications need to adapt their behavior based on the user's power state. The Battery API Checker lets you verify that the Battery API is accessible and see exactly what data it provides — charging status, level percentage, and time estimates — without writing any application code. This is particularly valuable for testing across devices, since browser support varies significantly (Android Chrome supports it, iOS Safari does not).

Privacy & Security

This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.

Frequently Asked Questions

Why does the tool say the Battery API is not supported?

<p>Apple removed Battery API support from Safari and WebKit in 2019 for privacy reasons. Some desktop browsers also do not expose the API. It is primarily available on Android Chrome and Firefox on Android.</p>

Is battery data accurate?

<p>The data comes from the operating system's battery monitor and is generally accurate to within a few percent for charge level. Time estimates (chargingTime, dischargingTime) are rough approximations that depend on current usage patterns and may not reflect actual time to full charge.</p>

Does the Battery API affect device power management?

<p>No, the Battery API is purely read-only. It accesses the same battery information that the operating system displays in its status bar or settings panel. The API does not change charging behavior, wake locks, or power-saving modes. The BatteryManager object also fires chargingchange, levelchange, chargingtimechange, and dischargingtimechange events, letting applications react to power state changes without polling.</p>