Windows can create a detailed battery report with one command (powercfg /batteryreport), but the HTML file is long and hard to read. Battery Health Lab parses it in your browser and shows battery health %, capacity wear, cycle count and the capacity history trend. Nothing is uploaded and there is no sign-up.

Also included:

Battery life calculator: runtime from capacity and real power draw
mAh to Wh converter with the 100 Wh airline check
Charger wattage checker: will this charger keep up, or will the battery drain while plugged in?
Real battery report data from four Windows laptops, with a CSV (CC BY 4.0)
Free guides for Windows 10/11 battery reports, powercfg errors and battery drain

Built with plain HTML, CSS and JavaScript by Kamran Liaquat Ali, a software engineer in Karachi.

Battery Health Lab

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