My best advice to you is to invest in at least some type of soldering iron. Running electric cars, you need to have one. I think all rc'ers should have one. They aren't expensive for a decent one. Then solder the right plugs on.

But if you are that concerned about it.. find batteries with 4mm plugs. Gens ace are good cheap batteries with 4mm bananas.

If all else fails bring it to your lhs and have them do it.