Batbox uses 3 batteries. Thats 6 redstone.
So you are wrong about batbox not using redstone.
I think I meant as in a signal (EG switch/torch) and not literal redstone, but I'm not even sure since I hadn't built batboxes for a while when I'd made that post. (Then last night's login issue thing struck and I decided to start an SSP world too.... oooh joy do I know the batbox recipe now)