For the first question, you can simply ignore the battery altogether.
For the FRAM, you will have to find the "SRAM hack" for Mega Mean Wily Wars. The game originally was released for Serial-eeprom RAM.
If you want a compilation of two games that save, you will also have to use the switching method to bank-switch the RAM as well, so they do not overwrite each other's save files. You can do this with a single switch and a bigger SRAM IC to switch out the old one with. Or you could do it with logic ICs and have the ROM/RAM switch with the click of the reset button.
My option
Another option
You can check if your ROM is USA, Japan or Europe buy looking at the header information.
Download a Hex editor (I prefer HxD) and then read this post:
http://www.epforums.org/showthread.p...68#post1774268
In that post, I show how to make any ROM region free.
You always have to swap byte. I suspect that an address pin may be left floating, or you put the ROM in the socket wrong.
Did you place the ROM all the way to the "right" of the socket?
Look here closely;