Abstract: The present invention is a supplemental power cell that increases the top-end speed of an RC vehicle and that can be coupled to an existing RC vehicle power supply with minimal cost and effort to a hobby enthusiast. The supplemental power cell includes a rechargeable power cell, preferably a conventional rechargeable nickel cadmium battery, means for coupling the power cell between an RC vehicle power source and an RC vehicle motor and means for removably securing the supplemental power cell to an RC vehicle. The rechargeable power cell includes a cathode and an anode for conducting electrical current. The means for coupling includes a cathode lead connected to the cathode, an anode lead connected to the anode, a first connector that receives the cathode lead, a second connector that receives the anode lead and a tie lead for connecting the first connector to the second connector. The means for securing is preferably a hook and loop fastener having a first portion that is securable to a second portion.