Slightly off-topic, but what are those connector-brackets that you've attached to the "military" battery terminals?
I've used/have the same terminals, but have never seen that setup - cleaner than what I'm used to, and I'd like to get the same set.
Those are included with the Slee tray. You need those due to the central location of the terminals on this particular type 31 battery. Basically extenders. Unlike most batteries, the terminal posts are quite far from the edge.