it doesn't when I tried it mate, running IE8 with all updates etc. tried on other battries (not NiMH) and it does.
I have just looked at the single cell sub c batteries and they seem to be around the 67g to 70 g area, as these are 1.2 volt I supose 10 of them would be needed to get to 12 volts, so looking at the 700g area. a lot less that the 2.5kg of my gel battery