This is probably a pretty newbish question, but I'm new to lipos and this is my first time encountering a problem that made me think about it. But do lipo's expand during use, due to heat, charge etc.? Or is that only when they "puff"(is that the term?)? I ask, because I'm building a setup to which, my 3S soft packs, will be a very tight fit. And I can only create so much space before I would have to build a new chassis, which I don't want to do, since it's a "vintage" truck. So any wisdom would be appreciated. Thank you for your time