返回设备电池的当前状态（只读）。
参见 BatteryStatus 枚举了解可能的值。
电池状态包括设备是否已插入电源以及电池是否正在充电的信息。如果目标平台上没有电池状态信息，则此属性会返回 BatteryStatus.Unknown。
其他资源：batteryLevel。
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