IBattery

Charge level and charging state.

• Wraps: Battery Status API (navigator.getBattery)
• MDN: Battery Status API
• Home: Rask.Core.Browser (all hosts)
• Shape: one-shot (GetStatusAsync) + subscription (WatchAsync pushes to a callback)
• Availability: Web/Server ⚠️ (Chromium-only) · PWA/WASM ⚠️ (Chromium-only)

GetStatusAsync() reads the current BatteryStatus (level 0.0–1.0, charging flag, and — where the backend reports them — charge/discharge time in seconds) once, or null where the platform doesn't expose it. WatchAsync(onChange) subscribes to level/charging changes and returns an IAsyncDisposable; dispose it on unmount. Browser support is Chromium-family only (Firefox and Safari removed or never shipped the API), so gate on a null status rather than assuming a reading.

See also

• Source: IBattery.cs
• Capability matrix
• Browser APIs — the narrative map