How do I get estimated battery life on Windows Phone 7

Back in the good ol' Windows Mobile day (CE based) one good get a rough estimate of battery life using the CE CoreDll.dll. Well sometimes at least depending on your hardware. This was exposed via GetSystemPowerStatusEx.

WP7 be开发者_C百科ing SilverLight based I'm assuming these sorts of Interop approaches will no longer work. Is there an API that exposes power status info? I've done a quick search and browse but didn't see anything.

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Currently there is no API method that will return the battery life.