Looks like the original is the standard flat 2 wire that most AA battery setups take whereas the lipo uses a deans connector if you buy the one from them that they offer. I would use a better connector like a traxxas connector that way you cant plug it in the wrong way and cook everything. I would get the truck and look at how much space you have for a lipo and go from there. Either way from what i'm seeing you will have to get a lipo battery mount (don't worry they are pretty cheap just get a Velcro one) since the long skinny lipo wont fit in the square battery box. Once you know what kind of space you have order a good quality lipo with connectors that you like and then just install the same connector on the truck along with the new battery mount and you should be all good! Don't worry too much about having to solder, its pretty easy just get a decent iron and watch a tutorial on you tube and have at it!