it has nothing to do with what class u race.. it has to do with battery care... all nicads and nimh packs seem to have better voltage and last longer doing the discharging...
stock motors like more voltage.. in stock run time is not a factor..
it is also good to do your packs the same every time.. to insure there performance as long as posible..
u do not need to leave the pack on for 6-7 days.. that is more of a ploy to get u to by one for every pack u own... get a voltmeter.. hook it to the pos and negative of the pack.. keep the pack on it until u notice the voltage does not go down anymore. then it is safe to take it off.. even when the lights go out there is styill a good amount of voltage in the pack.. thats why the voltmeter is good.. so u know for sure it is the same every time..
if u have a turbo 30 battery charger just hook the small voltage reader leads up to the pack and it will read just like a voltmeter... but a meter is better, because if u are charging u cant use the leads from the charger..
HERE IS MY TRADER FEEDBACK ON HOBBYTALK. http://www.hobbytalk.com/bbs1/itrader.php?u=8257