alternative to ib 4200?????

[big air]

is there a real alternative to ib 4200???? im in the market for some new cells and im just about to start doing off road,

if you had say 2 identical buggy's same motor gearing etc and done a drag race,

one car had ib 4200 the other ep 4200 would there be a difference, or am i stuck with ib's at the minute creeping on my tipy toes

i will be running a 5.5 brushless system so am i right in thinking run times will be close if i use lets say 3300, or will i be dumping all over the place.

and does a buggy zap more power from the cells than a touring car


if i do go for the ib's does anyone know where i can get a good "safe" from to keep them in while i charge them