A PCC is a Personal Charging case. It's basically a battery pack, that looks somewhat like a pack of cigs, that usually charges a single battery (multiple times), can be recharged itself, and also holds an atomizer and a few carts. very handy. Especially for the 510 (not great battery life), it's almost a requirement.
I don't own a Jantystick, own a 510 and others. Many are happy with their JS, but I think I'll wait on a more durable metal JS, preferably with 510 adapters.