Not only is runtime quite a bit more but the voltage is quite a bit higher(Highest we have ever seen in the R/C industry) and resistance is SUPER LOW.
Where on 3300's at 35 amp discharge 1.17's or 1.18's were really good you are seeing 1.22+'s on 4200WC's.
The lower the resistance the more PUNCH the battery will have.
On a good 3300 pack a 16-19 was considered good or a 2.0-2.4 was good.
On Ib4200's your seeing 1.2-1.5 or 11-13
So they are quite a bit better.
With the MORE runtime you get that HIGH voltage and LOW resistance for a longer time.
Plus the price of the GOOD packs is actually cheaper with IB's than what they were with GP's in MOST cases.
Be sure to buy a quality charger with adjustable peak detection.
A good discharge device that will do 20-30 amps and then a discharge tray that will cut off at .9 volts per cell.
Tekin Battery Doctor,RaySpeed Tray,Trinity D90,Novak Smart tray and more.
Goodluck with your new cells.
*****Look me up on Ebay. I will have alot of stuff going up as 7/7/2016. User name is Dalracer.**** This is going to be a BIG ONE!!!!!!
Just wanted to say Thanks to RcTech for all these years of Great Information.