BENCH/tests/battery.html

[ Power ]

Battery & Power Test

Reads live charge level, charging state, and time-to-full/empty estimates from the Battery Status API, and plots charge level over time.

Battery API not available here

The Battery Status API is only implemented in Chromium-based browsers (Chrome, Edge, Opera, Samsung Internet) over HTTPS. Firefox removed it and Safari never implemented it, both over fingerprinting concerns. Try this test in Chrome or Edge to see live battery data.

Unsupported in this browser

// Charge level history

Charge level

—

State

—

Time estimate

—

Charge level

Charging—

Level—

Charging time—

Discharging time—

Values update live as the browser reports changes. Chrome rounds level to the nearest 1% and quantizes time estimates to reduce fingerprinting.

// Event log

BENCH — client-side hardware diagnostics All tests run locally. Nothing is uploaded.