I run two minnkota deep cycle batteries on my trolling motor and notice my trolling motor getting weak quick. So I checked my water level in my batteries and found 1 to be half empty. I filled it back up with distilled water when it was at full charge, but still do not have power I had before and tm goes dead by noon. Did I burn up my battery? Is there anywhere that can check it because I don't have a multi meter. what kind of batteries do you guys use and what kind of run time do you get out of them?