game gear info needed

[freakinsega]

Might sound like a bad question but are there any game gear games that have an internal battery for saving games?
I have 5 or 6 games but non have a save feature. Looked around but did not find any thing on Google.

[dashv]

Other interwebs discussion on the topic:
http://forums.sonicretro.org/index.php?showtopic=27133

A somewhat official list:
http://www.smspower.org/Tags/MemoryBackup