So, back to the original question...
Does anybody know the maximum battery size for the FMP 1.8? Also, MJF, do you happen to know if the
Cameron Sino battery that you linked to on eBay in another post will fit? Cameron Sino batteries seem to come highly recommended, as opposed to those other cheap Chinese batteries you find on eBay, which may or may not be any better than the one that came with the player. I contacted the seller, and I believe he was trying to find out the dimensions from the manufacturer, but I haven't heard back from him in a few days, so I'm assuming he never got an answer.