Hi Lisa welcome to MobileRead and to the Kobo forum.
It's quite normal for your battery indicator to drop a bar almost immediately after you charge it. Many people have reported that. If you search there was a thread last year where 3d0g tested his Kobo battery by continually pressing the next page button and recorded the battery charge. Although 900 page turns is quite low - you really should be getting more like 2000 or 3000 as a minimum. Are you counting real "pages" in the book or actual presses of the next page button? Also adding, deleting and opening books etc can use up your charge.
When you finish reading are you turning the Kobo off or letting it sleep? Also do you have a wifi Kobo or the original?
I'm sorry I can't help you with your USB problem. I only know that at times I have forgotten to eject it after charging and haven't had any problems. Whenever I add or remove books I use Calibre and sofar I have remembered to eject in Calibre.
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