Can anybody point me to a place that has specs for common batteries (C, D, AA, etc.)? I'd thought it would be easy to find on the web, but I've not been able to get past all the pages trying to sell me batteries and find any specs.
Why am I looking? Well, last year we bought one of those VCRs In A Bag for the car when we went down to NC. This time, they had portable DVD players for $99 at Target, and I couldn't resist getting one, so we could take DVDs for the kids (which we have more of anyway). We ran the screen (4" TFT LCD) and player off the cigarette lighter. But now I wonder, if I ever wanted to take it along on a plane in lieu of a laptop to watch movies (which I don't personally own, and which if I borrow one from work makes me more likely to actually do work

) could I plug some batteries into the DC In jacks? It's obviously possible (they're both 12V DC), but the question is, how long could I run such a setup on a pack of batteries?