I had a similar problem with my jetBook (takes forever to finish charging, loses its charge very quickly while off, only ever seemed to show 2 bars of charge etc), and I found out what I was doing wrong.
It seems like leaving a book open triggers some sort of sleep mode (on the JB-5, at least). If I left a book open, instead of quitting to the main menu, I would lose all charge in about 5 days of inactivity, and the charging cycle seemed to go on forever. If I quit to the menu, both of those issues cleared right up.
Dunno if it'll help, but there you go.
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