I picked this up on MobileRead, and thought it was worth passing on. I've never had any battery problems, but this may be of help to someone........
QUOTE : "Common Recharge Problem Fixed, might help
My Sony PRS-T1 went into the Empty > Charge > Short Battery Life then the Empty > Charge > No Battery Life Mode.
I tried various Chargers, No luck
I tried Resetting, No Luck
In the end the charge light wouldn't come on at all.
Checked Cable but OK.
In desperation I plugged it into the computer USB socket and left it.
Well, at least it started charging again, but little battery life.
Would not reset.
At last, I tried putting it into the computer socket and waiting till the charging light came on and the book opened.
Then, and this is the important bit, I reset the Reader
*** WITHOUT UNPLUGGING FROM THE COMPUTER ***
For me only a soft reset was necessary, but you may have to do this more than once.
That finally did the trick and the battery life is quite back to normal.
Switched off the WiFi, a week's reading and I still have all four bars on the battery meter.
Hope this may help a few folks! " - : QUOTE.
HOPE IT DOES !!