ABOUT THE FIREFLY 2+ BATTERY The Firefly 2+ Battery has a power output of 770mAh, is rechargeable, and is a lithium ion unit. This vaporizer battery is compatible with the Firefly 1, 2, and 2+ vaporizers. Keep this original equipment manufacturer product in your Firefly to ensure consistent performance. WHAT'S IN THE BOX 1x Firefly 2+ Battery