Want Speed? No problem, here is the solution, a Lithium POLY kit for your xmods evolution, exact fit to where the battery tray used to be (when you remove it, that is) soldering skills a MUST when installing this kit, you have to use extreme caution, just imagine you are playing with some hazardus material. if you mistreat this pack, you will suffer the consequences. that is with any li-po battery. the pack has 2 sided 3m sticky tape. 1.5mm black heatshrink, Micro Deans Plugs, and a board harness. We are not responsible for anything after this pack has been shipped.