I was lookinh for advice on making a vape pen for spice. I have the concept for the liquid part, but got lost on the info about battery. I smoke the cartridges with preloaded thc which can be pulled apart at the mouth piece. Can I make the ejuice with spice and just reload it with a syringe or something along those lines?

Those small cartomizers are far too low powered I'm afraid. They just dont put out enough vapour to carry enough of the spice with each hit. Youd only get some mild visuals.

A small, cheap sub-ohm pen would work a lot better. a small medium power vape with a coil around 0.3 to 0.5 ohm and a VG/PG ratio of 50/50 or 60/40 is best from my experience. 3 deep hits held in and BOOM!!!! Hyperspace!!!

QFT! Even the adjustable pen batteries just aren't "enough". It's a shame how much is wasted. Good advice by Darth. The carts are convenient if you're looking for a portable solution but i consider it almost sacrilegious to taint the magic with any eliquid