The guy does respond by email. He says he put away the batteries until spring, though. He may or may not be still willing to sell.
I've tried to research online to see what they are, but I think these are just SLA.
New to endless-sphere? Notice a lot of signatures recommending Ebike.ca? That's because it's the best place for a quality and manageable, (but still 'real'), first build. Justin is a solid supporter of electric bike development, and a good source of equipment.
My hat off a thousand times to the green people that effectively run this forum. The ES Mods are superb.