You can always get two powerlabs and link them together if needed. I was going for the Icharger, but then the rumors started on the Powerlab and I just waited it out. Now they are they only one with a 40A output charger, which was unlocked with one single firmware update.
There is the FMA 10S charger that can do two different packs at once, but you are limited to 10A. Sells for 100 bucks now.
You can push the batteries beyond 5C and still be ok. You do get a bit less capacity, but does it really matter, when you have to wait less for charge time? Evens out to me.
On the FMA I have set the buzzer at 90% battery capacity for the lipo's. That extra 10% is mostly used for topping off the pack anyways at a lower Amp rate. So less stress on your car battery, if charging at the field.
I bring this to the field.
http://www.xantrex.com/power-product...pack-1500.aspx
