From CNET: A bug in Android 5.0 Lollipop was draining Nexus 5 smartphone batteries at a fast clip, but the Wi-Fi-related glitch was fixed by early Thursday.
Nexus 5 users who had received the Android 5.0 update had been complaining that their phone battery would drain much faster than expected when Wi-Fi was enabled. Users piping in on the Android Developer Preview site noted that an entry on their device's battery stats screen called "Miscellaneous" was sucking up a lot of juice.
On Wednesday, Google's Trevor Johns, a senior developer programs engineer for Android, confirmed the bug on the Android Developer Preview site:
Android Engineering is aware of an issue affecting Nexus 5 users running Android 5.0 which causes significant "Miscellaneous" battery usage while WiFi is enabled. This appears to be caused by an abnormally high number of IRQ wakeup events.
We are continuing to investigate this issue.
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