Yeah, I've been there too. On both sides: parent watching with the dawning horror that I am about to have a screaming child, and kid who has to WAIT until batteries are located and inserted into the BEST Christmas present ever (that I will likely forget about in a week or two.)
So, I'm thinking I need on of these...
Energizer's Smart Charger looks all kinds if awesome. It counts down until the batteries are fully charged, alerts you when a bad battery in installed, and you can charge either "AA" or "AAA" batteries. Yep, I think this little gem will be headlining my Christmas wish list this year.
Thanks to The Shopping Mama for the heads up on this one!