Need better connectors

[Jabe]

I have two battery setup (parrel), i currently have 5mm bullet connectors, but those are too loose, after few jumps, another battery is loose (disconnected).
Is there any connectors that would have "lock" like tamiya-connectors, but rated for +100A current, deans-connectors i wont use as those are too loose also, so it eliminates traxxas-connectors also.
So im searching connectors that would have "lock" and are rated +100A, dont care if its single or "dual" connector.