I had a similar issue this spring with my Dakotas that are hooked up for my Humminbirds. Dakota’s website says to “reset the batteries” by hooking it up to a Dakota Lithium brand charger. I use a different brand for on board charging (NOCO) and it read as constantly charging but would not fully charge. I took the advice from Dakota, tried it and it did a total reset for the batteries, charged them up and problem solved for me.
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