Battery pouch is a (modified with extra velcro and an easy grab strap) BFG BooBoo pouch on two sewn-on 2" Multicam webbing strips. It's the perfect size for an ANVIS pack, who knew?
This takes nothing away from your work, which is clearly Top Shelf.
If My Brother From Another Mother says so (and he just did) that confirms it.
Keep up the good work!