Originally this was going to talk about electrical type power packs for just Main battle tanks. I had the idea about replacing the internal combustion engine power plant with a electrical one(fuel cells,capacitor banks, batteries,etc). I was also thinking about making a separate electrical APU as well for on-board stuff.
Of course I can understand that there are problems with such a idea. There are also some advantages as well. one of which is being able to use places with electricity to charge up the power pack. they could also be more economic and less of a hassle with environmentalists. Also less moving parts= less overall complexity. Of course overheating could be a potential issue. electric powered AFV's could be quieter as well.
This is all theoretical at the moment. This is more to discuss weather such a concept could be viable, given time and attention.