I've looked through the forums a fair bit and have found out a lot about the PRS500 and ebooks in general. After spotting a thread about changing the battery in the 500 I decided to have a go as I was only getting around 400 page turns per charge and assumed my old battery was dying.
I picked up a new battery and installed it using the guide. Put the reader back together and everything worked

However, after a full charge I still only seem to get around 400 page turns with the new battery.
I am generally reading pdf or lit files that I have converted to lrf using calibre. They are text only so no fancy graphics to draw. Also have the latest Sony firmware installed.
Does anyone have any clues as to why my page turns might be so low? Could it just be that I am not reading much each day so my 400 page turns is over a couple of weeks?
Thanks
Matt