Glad I wasn't the only one who hadn't heard of them
I'm definitely curious about building some honkin' power packs. Not for festivals, but for power hungry preamps, etc.
Weird that it doesn't include a wart.. But that is a powerful wart - 5 amps, so that is unusual. You may not find it at the shack.
I'd do some searches for reviews in r/c airplane forums before ordering, to figure out which model and import dealer is best.