Maybe do a hard reset? If that doesn't work, maybe even upgrade the FW. You might also have a bad book on there causing battery drain, though I've never seen this happen on an Onyx. Also set power mode to battery saver if you haven't already. It freezes background apps. You might have an app in the background sucking power. You can look in battery usage to see what is using all the juice, or you can download an app to record battery usage by app. How old is your Poke? It's possible the battery is getting exhausted. Do you read a lot? That can wear the battery out. I actually just replaced the battery on Nova gen 1.
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