My Norsk charger shows my battery fully charged but my Humminbird Helix unit shows less than 100%

Please check if your Humminbird software is up to date. Humminbird released a software update so that you can change the “battery type” of the unit to work with lithium batteries.

Updates can be found at

Also make sure you are selecting the correct unit for updates. Select “Ice Series’ if you are using a Helix Ice unit.

Once you have completed the update – navigate to “Settings” and select “Battery Type.”

Change the “Battery Type” to 11.1v Lithium NMC (see picture below).

20211228 125054 scaled 1