Therefore we sponsor these events through other activities with the event organizers. At this time we have no re-furbished units for sale. Questions about speed control selection are addressed at RDFR .with popular models for particular weight classes noted. Pricing is listed separately. Although we can only offer limited individual advice and engineering services for robot design for competitive robot events this page is a brief discussion of some basic design considerations about batteries, speed controls, motors and gearing.
Batteries supply the power and they're always rated in Ampere Hours.
Sometimes they also have other ratings. For a given chemistry these bear a relationship to the basic ampere hours. An ampere hour is the current you can draw out of a battery for an hour before it goes dead. A 7 Ampere Hour Nicad chemisty battery would have significantly higher peak amps. Check the regulations of your event for outlawed battery chemistries.