Deans - Resistance?

[Benh]

I use Deans - main reason is that trackside in the blind panic of getting a car on the line I would not want to accidently plug up the +/- the wrong way round. However: -

I have just found that a new deans connector was faulty after putting on an ESC. (Spent quite a while checking ESC to then find it was the deans connector) After speaking with others this has happened qutie often before.

I am now concerned that cells I thought were useless were actually ok and it was the deans connectors at fault.

Does anybody know of any super deans that will have very low resistance and/or a method for soldering that minimises the causes of the above?