@MrGhostWriter My NotePro doesn't go from 100% to 79% in 1h20m. It goes to 80% after a day of reading. So it seems that the system is working okay, but your battery needs to be replaced.
Do you still have warranty? Does the battery fall under Onyx warranty?
I haven't replaced my battery, yet: My NotePro is still going strong after 8 months of use. However, at some date I will as I have replaced most batteries of most of my mobile devices. So if you can't get it replaced under warranty, try searching this forum for people posting about replacing the battery or about opening the Onyx NotePro. If you can get a clear photo of the info on the battery, I'll try and help whether I can find where you can buy a replacement.
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