i need to know some stuff about the batteries you sell.

1) what should i run these maxamps 11.1v batteries with? do i need a bec, balancer, what?
2) if i need these things, how much would it cost if i were to buy the ARTR e-revo kit with these?
3) the ARTR kit doesn't come with the power source? how much would that cost?
4)what is "puffing"?
thanks!

what are you running 11.1v with? if you get and e-revo you will need 2 7.4v batteries run in series connection to create a 14.8v connection. the price on the batteries you can find at www.maxamps.com, and as for the revo check like www.towerhobbies.com for that one. puffing can be caused when the battery is overheated or goes beyond the cutoff point on the cells.