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I haven't seen any battery drain issues with any of the firmware revisions I've used on my Aura One. It seems to be a issue limited to a few units but I haven't seem any reports that indicate specific hardware or battery issues.
For highlighting, I mostly highlight errors for later correction so I'm not highlighting masses of text for later reference. I've seem some differences between highlighting with firmware revisions, currently I'm quite happy with the highlighting. If you need to highlight masses of text, using kepubs would be recommended so you can highlight over page boundaries.
As for sideloading? I tend to keep my devices on the newest firmware. Sometimes, that does lead to life on the bleeding edge.
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