my lowrance 522 does the exact same thing…. wow.. I was kinda thinking my mechanic didnt hook stuff up right??? I got in a pickle last week and starting battery went dead, so I had to buy one in a small town.. got the biggest he had but it was only 850 cca.. 1000 warm. my lowrance was doing this same thing with my last battery as well , it wasnt big enough either.. sucks to spend 86$ and still not have what I need.. thanks for the info.