It's interesting.  Those in the hole don't realize how deep the hole is until they are out.  Case in point: my GBA.

I got my DS about a week ago.  I've played about 2 hours of Lunar on it since then.  A day or so after getting it, I had the urge to play a GBA game as "advanced" as my new system.  I picked up Sigma Star Saga, a game I had received for Christmas, but never really touched due to to it's difficulty level (which starts high, but drops quickly).  Basically, I was stunned that I didn't have to plug my DS in to charge after a few hours.  I never realized how little charge my GBA batteries held anymore.

The question is now, do I get new rechargables for my GBA?  I have a rather extensive collection of GB and GBC games that the DS can't play and I don't want to be left with only the GBA Player as access to them.  On the other hand, it's more money I have to spend.  Yuck.

Oh well.  Hopefully I can actually use my DS as a DS when Castlevania arrives.