CF-31 Parts Compatability

I have a cf-29 and am upgrading to a CF-31. I am wondering what, if any, parts I can use from my 29, in the 31.
only the keyboard and charger i have found that seem to be compatible between the two.



Additionally, while looking for media bay batteries, I seem to have read somewhere that media bay batteries are only available for the i3 series because of real estate issues, is this correct?

Main batteries, the cf-31's are separate? Im having a hard time finding new ones for under $100,...

CF-31 Parts Compatability

CF-31 Parts Compatability