Battery Status & Health Test
Inspect real-time laptop and mobile device battery statistics using the HTML5 Battery Status API. Monitor battery charge percentage, AC power connection, and estimated discharge runtime.
| Power Source | Detecting... |
|---|---|
| Current Charge | --% |
| Time Until Full Charge | -- |
| Time Remaining on Battery | -- |
| Battery API Support | navigator.getBattery() |
Battery Longevity Tips
To maximize lithium-ion battery lifespan, avoid keeping the battery charged at 100% permanently when plugged into AC power. Keeping charge between 20% and 80% significantly reduces chemical degradation.
How to Use This Tool
- Open this page on your laptop, tablet, or smartphone (best viewed in Google Chrome or Microsoft Edge).
- Look at the large battery gauge to see your current charge percentage.
- Plug in or unplug your AC charger to verify that charging state detection responds immediately.
- Review the Time Remaining on Battery or Time Until Full Charge estimates.
Why Does Safari or Firefox Show "Unsupported"?
The W3C Battery Status API (navigator.getBattery()) is fully supported in Chromium browsers (Chrome, Edge, Opera, Brave). Apple Safari and Mozilla Firefox disabled this API over privacy and web fingerprinting concerns. If you are on macOS, open this page in Chrome or Edge to view live battery telemetry.
Why Desktop PCs Show 100% AC Power
Standard desktop computers do not contain lithium batteries; they are powered directly from wall outlets via internal power supplies (PSUs). Operating systems report a simulated 100% constant AC state to browser queries.
Lithium Battery Longevity: The 20%–80% Rule
Lithium-ion cells experience the most chemical wear when held at high voltage (100% charge) while warm. If your laptop stays docked at a desk all day, use your laptop's battery management software (Lenovo Conservation Mode, ASUS Battery Care, Dell Command, or macOS Optimized Charging) to limit charging to 80%, which can double your battery's usable lifespan.