Took out my H2Oc this evening to hardwire it into my boat using Lowrance's power cable. Before I even had it hooked up, the opening screen would not stay on. I figured the batteries were dead and replaced them. Second set got to the satellite page but the battery meter went from full to empty in about thirty seconds. Upon opening the battery door, I noticed that a hole had burned through the Navionics chip and the chip was extremely hot. I took out the chip and put the batteries back in and the unit functioned normally. The second problem is that now the cigarette lighter adapter won't work on it either. It won't recognize that it's hooked up. I tried another cord and another H2Oc on my cord and that GPS was normal. Any ideas or speculations would be helpful.