Hi cornelius, not from GM. I think it is a Crytalite product, it came with a battery bag I just purchased.
Monkey,  yep, for the new build 

    hopefully for dual mini's 

.    the ignition key could make things a little more convenient.   I'm just a bit apprehensive at present on buying a dual mini kit until it has been tried and test with possible amp limits.   The battery I have is a 54v 16ah lithium ion pack