Battery Question

AA and C are both 1.5 volts. I believe the difference would be the battery life, meaning in theory the C would last longer. I think the key is finding a good brand though. I have had the best luck with Duracel. If you are in the US you can usually get a large back at Sam's club or Costco. Hope that helps.

More info:
http://www.allaboutbatteries.com/Energy-tables.html

My family uses Duracell, and very rarely we have to buy different brands. We ran out of new Duracell AAs, so I used Kodak Max instead in the Spencer I restored today, and I think it runs a lot better than any of my other AA-trains.