crystal sets wtf this isn't 1876. SPREAD SPECTRUM MY SON, SPREAD SPECTRUM
p.s. its a bit scarey that we've bought very competitive cars. I for one shall just be crashing and breaking it I suspect!
p.p.s. charging sleeve is to put battery in when charging. For the paranoid or those who bought shite Chinese chargers on the cheap!
p.p.p.s. been told one pack is enough, but you need to be able to charge between races. Not a great time to buy more packs as the standards don't appear to have been finalised yet so you may end up with illegal packs. From discussions here it seems trakpower may fall foul of the rules due to not being tamper proof