In the extreme cold up here, they shut down on people.
This is incorrect. I’ve used Norsk batteries for the past 3 years on all my ice trips in all my Helix units and their lithium ion batteries have never shut down in the cold regardless of temperature.
I’m familiar with the testing that hummingbird engineers put all the lithium batteries through that included extreme cold, vibration, perpetual charge and discharge cycles. A number of batteries from a variety of providers we’re considered as OEM batteries in the Helix shuttle. Norsk came out on top.
There no way Humminbird would partner with a battery company that produced batteries for ice shuttles that won’t be able to handle extreme cold.