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My device is old but has very recent FW upgrade. I would be surprised if onyx has removed the feature. Perhaps someone with a newer version could confirm. I access it by tapping the top bar in the home screen. It appears as a battery icon. I would also freeze all apps. Have you installed any apps that might cause this? It is also possible that a bad book can cause battery drain. Reboot the device and if all else fails to a software reset.
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