Razor speed booster kit adds 5mph top speed and more torque (battery not included)
use any brand high power thick wire "nimh" 7.2 volt r/c battery with Tamiya connector
3000 and up MAH
how to install video's on youtube/mykwilwin
I also have these listed on etsy $15 and ebay $20
ships from Tustin, CA. with USPS.