I just did the lipo mod and let me tell you. It was so easy. The radio works with the battery tray or with the lipo. can tell there is a little weight difference also. Very easy. I can tell anyone how to do it or ill do it for you if you would like. I can tell you where to get very cheap lipos also that will fit in there. Let me know by email at [email protected] or pm me on here. I cant wait to race tomorrow with it now. No more double a's and buying them and being all expensive. This will def pay for itself in a couple of months.