So here goes, I have maintained my batteries fairly well over the last few years. Changed out one due to allowing the water level to get too low. Also had Plum Quick rewind the motor for 25% more tourgue and speed. Well lately I have noticed the fully charged batteries don't last as long. They are 5+ years old. Weird thing is all cells checked out good using specific gravity test. Showing 53 volts when charged. Am I missing something?
Any help would be appreciated.