Cart 0

Gemini 4000mAh 2 Cell Battery

  • $5999

Gemini's new battery packs are loaded with capacity and functionality.
Built with 21700 cells instead of 18650 cells they are slightly larger and heavier but come with a higher power to weight ratio.
On top of that they have some neat tricks up their sleeves.
They have the standard 5.5x2.1mm round connector used to power the light but also have a USB-C plug to power your phone, Garmin, GoPro or any other USB powered device. You can use both at the same time.
There is a fuel gauge on the side of the pack that with the push of a button tells you how much power you have left.
They can be charged using either port using a 5V USB charger or 8.4V wall charger.


A durable outer shell made of high strength poly-carbon has yielded an increase in double the impact protection from the previous generation. The high durometer rubber end caps protect your frame.


  • 2-Cell Battery 30Wh 7.4V 4000mAh
  • Lithium Ion 4000mAh Cells
  • DC Port Input 8.4V, USB-C Input 5.0V
  • DC Port Output 6.0–8.2V, USB-C Output 5.0V
  • Onboard fuel gauge

Gemini Use and Charging Instructions

We carry a full collection of cables for USB-C to Lighting, USB-C to Micro USBUSB-C to USB-A, or USB-C to USB-C to connect your battery to your Gemini Light and/or external device, or similar light heads.

We Also Recommend