Will save files from an R4 SDHC work on an Acekard 2i?

My daughter is upgrading from an R4 SDHC to an acekard 2i and I was wondering if the save files she already has can be used on the acekard as she doesn't want to start all the games from the start.

Yes. You may have to convert them.
http://www.shunyweb.info/convert.phpThe AKAIO 1.5 firmware defaults to using the same naming structure:
GAME.NDS
GAME.SAVThe official Acekard firmware defaults to
GAME.NDS
GAME.NDS.SAVSo you may need to rename the save file accordingly.