I would look at the Duratraxx brand chargers::::: ONYX there are several models 1 of witch charges two batterys at one time but NOT lipos.. There is a model that does charger lipos but not 2 at a time. You want a Peak charger not a timer deal...

I would go with lipos and I wouldn;t get anything less than 5000 mah so you can get the longest run times possible.

I am not up on the Summit but I have looked at one and they look to be a nice model. I would look into one if I was more in to bashing.