Pretty much covered. Most ego/stick batteries use the ego charging cable to wall or usb/wall connection. If they are passthrough ego batteries, they use a usb connection.
Many APV's use changeable and chargeable batteries and require separate chargers, most of which will charge 18350, 18500 and 18650 batteries, among others. They are plugged into the wall.
Some APV's like the eVic are passthrough but also have removable batteries as well. You can use either usb or external battery charger.
Most internal batteries, i.e., those that are not removable use usb connections.
The usb connections are generally either mini or micro connections into the device. They vary so check carefully.
buying the batteries and chargers in a kit allow you to bundle those costs which generally will save you money versus buying them all separately.
Good luck, good question btw, Vape On!