ORIGINAL: cenracer1
the connectors on those batteries are designed for helicopters.. I purchased a bunch of these from Hobby City and they came that way.. for car use I cut them off and put on Deans plugs... I'm not sure of the name of them, but EC3 sounds correct.. I think Losi is starting to use them now on some of their electric brushless stuff.. They work but you will have a harder time finding connectors for them at the LHS if needed...
Connectors are not really designed for a particular application. Sure more heli guys probably use them but that's just because they've been using lipos longer. Connectors are just connectors, you can use any low resistance ones you want to. From the specs I don't believe the EC3 are as good as deans, traxxas or power poles but they are definitely a great improvement over the "tamiya" ones.