The Jerry 31 battery pack add-on provides owners of the Jerry 31 a remote outboard battery option for extending battery life from 20 hours to 75+ hours of continuous run time.  Moving to outboard power has the added benefit of reducing frontal helmet weight and increasing operator comfort over time.
The JerryC external battery pack comes with hook velcro that attaches directly to the back of the user’s helmet and accommodates 2x 18650 flat-top batteries or regular 18650 batteries with the included larger battery caps. A high quality coiled cable is included with battery pack.
An on-board power button enables or disables power from the pack and the pack can be separated from the helmet plate.