It's both disposable and rechargeable. It has to be rechargeable as the battery doesn't contain enough capacity for the total amount of juice that's stored in them. E.g. a vape could have 10k puffs of juice, but the battery only lasts for ~2k of puffs so you have to recharge it about 5 times until the juice runs out. But once it runs out, there's no way to refill the juice so they get discarded. I remember when these USB-C vapes originally came out, we were joking that vapes got USB-C before the iPhone did.