I ran the boat for a third time today and when we pulled it out of the water, one of the batteries was 83 degrees Celsius or about 181 farenhiet. The odd part is that only 3 cells were hot. The 4 other cells on the same battery were around 45 - 50 degrees Celsius, as was every cell on the other battery. Is this a problem? My dad did run it until it stopped, which I know is bad for the batteries but he won't listen.