My H2O original has been used heavily since new. However I quickly gave up on PDFs. All mine are either too large, or print too small. Even a 10" tablet is challenging on some. I now only have some PDF manuals where original is about A5 sized, mostly for Japanese Ham Radio products with non-intuitive menus!
I've no battery issue at all, though it does seem to be not quite as long life as it used to be.
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