I bought a set (read: three) of Blu tanks. I had the original Blu kit, and wondered if they would work. Answer: yes, the new Blu tanks will work on the old batteries. They will not zap your battery any faster than the original carts will. They also taste a LOT better, and give you the "sizzle" sound of a clearo. Maybe not so good for the stealth vape in the bathroom stall, but still. They are slightly bigger (the carts). But, that does not impede the function one whit. Yes, they last A LOT longer. If you are not ready to upgrade your Blu to Blu+, THE NEW CARTS WORK WITH THE OLD BATTERIES FINE.