510 Battery is just a regular battery, that gets attached to a Cartridge. Once the 510 Battery is attached to the Cartridge, it converts into being a Vape Pen. The Cartridge, comes along with a USB and is rechargeable. The Battery is only a battery and has no E-Liquid or Juice or THC in it. The reason why it is called 510 is because, 510 is a thread that helps screwing both the Battery and the Cartridge.