I was getting kind of the same scenario. I'd read 150 pages and it would lose a bar. 150 more and I'd be at 1/2 battery. I read about the discharge problems with the memory cards, so I took the card out and got a little better power out of it. maybe 600 pages to 1/2 charge. So I put the card back in, played music until the battery completely discharged, recharged it again, discharged completely one more time, and I am now 300 pages into a book with no memory card, and it still shows full. I used to have this issue with an Ipod, I heard with these types of battery, you want to go through 2 full cycles of charges to get optimal battery performance. Try that and let us know how it works.
