HoneyStick has given discretion a new definition with the MiniMax FOB Battery. This 510-threaded battery works with most prefilled cartridges; just hook this battery onto your keychain and take concentrate vaping with you anywhere. The MiniMax FOB Battery looks like a normal car key fob, but houses a 500mAh battery capable of producing voluminous vapor clouds from you preferred concentrates. A single button controls the MiniMax FOB Battery, making it easy to take quick draws while on the go. This innovative product may be one of the smallest batteries on the market, but its 4V output level delivers draws that truly pack a punch. To ensure convenient charging, HoneyStick gave the MiniMax FOB Battery a micro-USB charging port.