Has anyone ever opened it up to replace battery? Does it take the same battery as PRS-505?
All I found on google was a service manual for PRS-300 that showed how to open it up and where the battery is. Battery looks kind of like PRS-505, but part number is different.
PRS-300 Service Manual
PRS-505 Service Manual
On PRS-300, it looks like there are lot of claws & adhesive sheets while opening up the reader. I am not sure whether this is hard or not. Whereas on PRS-505, there are only couple of screws.
On 300, battery part is called "battery assy", whereas on 505 its called "(ion) storage battery assy".