Battery Connector Identification

[grue42]

Hi all,
I've come across a clever battery connection for a battery that gets inserted into a tube.
The battery terminals are wired to these posts, and the receptacles are panel mounted in the housing at the base - so when the battery is slid in, the posts plug into the receptacles and connection is made.  (The mechanism is keyed, so no concern of plugging it in incorrectly)




I'd love to use these in an upcoming project, but I can't seem to identify the parts.
The posts seem to be akin to an unthreaded car battery bolt with a birdcage on it, but with a matching receptacle? Does anyone recognize them?

Thanks!!!

Edit: Sorry, I forgot I took an exploded pic of the plug, too!