These batteries are meant for units that require a separate battery. They can be charged inside of a unit or through a stand-alone battery charger.

Because of the nature of these batteries the user should be aware of battery safety as well as the dangers if the battery is used improperly.

Here are some very thorough resources we encourage those new to using these batteries to look at:

http://onvaping.com/battery-safety-and-ohms-law/
http://onvaping.com/a-basic-guide-for-mechanical-mods-and-safety/