IconVault's Battery Status playground connects to the real `navigator.getBattery()` API: live charge level with a recording chart, charging versus discharging state, estimated time to full or empty, and an event log that fires the instant you plug or unplug the charger. Where the API has been removed, the tool says so plainly instead of simulating numbers. It is free and runs fully in your browser.

The lab covers the honest history too: Firefox and Safari dropped this API over fingerprinting concerns, so it is Chromium-only today. You will learn the four events (`chargingchange`, `levelchange`, `chargingtimechange`, `dischargingtimechange`), why times report `Infinity` when unknown, and the practical pattern of lowering work (fewer animations, deferred sync) when the device is unplugged and low.