Your files stay on your device

# Battery status test

See your battery level and whether it is charging.
navigator.getBattery · Chromium-family API · reads stop when the tab is hiddenRead battery

One press reads level, charging state, and the browser's time estimates. No reading happens on load: the battery API is a known fingerprinting vector, so it stays off until you ask.

- navigator.getBattery exists only in Chromium-derived browsers (and is being replaced by the Battery Status OS API elsewhere). Absent API: the page says so and stops; it never guesses a percentage.
- Updates arrive via the manager's events, and only while the tab is visible; the route pauses its listeners on visibilitychange so a backgrounded page does not keep waking the battery API.
- Battery level plus charging state is a known fingerprinting vector; this page reads it only after you press Read, keeps it in this tab's memory, and ships no persistence.
Paste, drop, or type to begin. Everything stays on this device.

## More device tests

- [Permissions viewer](/device/permissions)
[All device tests](/device)

---

Canonical HTML: https://nutter.tools/device/battery/
Markdown version: https://nutter.tools/device/battery/index.md
Plain-text version: https://nutter.tools/device/battery/index.txt
Agent index: https://nutter.tools/llms.txt