pede x5

I have four packs of sanyo 2400's, stickpacks. I want to use them with the 5300. Should I wire them to double the runtime and keep the voltage the same? I am just wondering- I would love to just wire them in series and have two twelve cell packs. If that is too much, then it's too much. However shouldn't I be able to technically do it as long as I don't gun the thing? Otherwise, yea I would probably run them parallel.