Battery Health Check
Check your battery status, charge level, and estimated time remaining. This test reads your battery information directly from your device using the Battery Status API.
Browser PrecisionHigh
Battery status read from the Battery Status API (Chromium only). Charge level and time estimates are provided by the operating system.
Frequently Asked Questions
Why doesn't the battery test work in Firefox or Safari?
The Battery Status API is only supported in Chromium-based browsers (Chrome, Edge, Opera). Firefox and Safari do not implement this API for privacy reasons.
How accurate is the battery health estimate?
The health estimate is based on current charge level and remaining time. It provides a rough indicator — for precise battery health (design capacity vs current capacity), use your OS's built-in battery report tools.
Does this test drain my battery?
No. The test only reads battery information — it does not perform any operations that consume additional power.