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So now that the weather has turned colder, my 1986 Mercury 75hp has a difficult time starting....more than usual. In this last month I've gone to start it and a few times it has ground down the battery while doing so. I've then charged up the battery and the engine turns right over. It happened again today when I went to pull the boat out for the season. This morning it would not turn over and I killed the battery (although I had it running yesterday). I put the charger on it, came back after lunch to see a full charge. Removed the charger, put cables back on and she started on the first turn.

Ideas? Should I get a new battery for next season? This one has been with the boat for 4 seasons. It sometimes has a difficult time starting in the warm weather too, not like this though...may take a 2-3 tries to start, but does usually kick over.