I have a 1 year old EverStart Deep cycle battery (115 Ah). The guy I bought my trolling motor from gave it to me. He gave me the receipt for the gear, so I know its only a year old. It leaks from the top vent caps. The motor is strong. It pushed my boat around the lake for a little over 2 hrs (14' with a minn kota 40lb thrust) with the motor at max speed almost the whole time. So, whats causing it? How can I stop it?