I have a list of which Genesis games use EEPROM or FRAM, that is on-cart saving WITHOUT a battery... did it as a part of my big list of consoles listing what save types each one has. I haven't done lists of all of battery-backed games though, sorry.

The newest version of the save-types list of mine can be found here: http://www.sega-16.com/forum/showthread.php?t=5965