Not answering your question ... but over the past 2 weeks I have been in a workshop where I have been constantly reading and annotating documents and using scribble to take notes. The battery from fully charged in the morning 8:30AM has been dead at about 5-6PM, generally with the device switched off for an hour over lunch ... so I've been averaging 7 - 8.5 hrs real world use when using scribble a lot ... it's about 2-3 hrs short for my needs currently (a full working day without having to think about it)
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