lol, I still do it I bought my kids a remote control electric race car and I got a bigger battery for it and changed the gear in the differential. that worked for a bit, pretty fun but the gear change wasn't perfect and it ended up eating the differential up. There getting new ones under the Christmas tree this year, these are made to use one or two batteries and I just got what they came with there not the super pricey ones that you would race with but should be funSo, you are the model for "Tim, the tool man, Taylor" uhhh, uhhh, more power!!!!!!