Thank goodness for real time save. This one seems pretty decent for the couple minutes I checked it out, unlike Cocoto, which is pretty lame from what I played of it....also only a couple minutes at this point. Both work fine with standard settings on a SCminiSD.
My guess is that since Ninty dumped support of GBA (prematurely, I think) they don't even bother to maintain battery save without charging some kind of exorbitant price for using it.
I'm still hoping we'll see the Metal Slug arcade 1 release.