I'm building out a large, 4-legged stilt costume that's got an arduino Duemilanove at it's core, 400+ RGB LEDs providing the light, and a bunch of sensors directing the show. I'm trying to figure out the best way to power the whole thing and I ran into someone else recently that's running ~350 of the same lights off a 6V 10Ah sealed lead acid battery and getting about 5-6 hours of run time. That sounds good enough to me. If I last 4 hours walking around on this thing I'll be amazed
So, I know that the specs on the Duemilanove say optimal 7-12V with limits of 6V and 20V. It's easy to find good, sealed lead-acid batteries in 6V and 12V, but not a lot in between. The 12V is *way* heavier than the 6V version w/ the same amp hours. Weight is a big concern for me since I've gotta carry this thing on my back and 3' off of the ground.
Question is... Should I be concerned about running this whole thing off of 6V (thinking 12Ah)?
My guess is that it will run great until the voltage drops a fair amount below 6V and then things might get a little wonky, but nothing will be damaged. If that's the case, I think I'm fine with it. Assuming it's 3-4 hours before things get wonky, but I can test that ahead of time.
PS - Saw @Massimo at the makers faire in San Mateo last week... the new arduino stuff looks pretty fun!