Travel Trailer Battery

Will your trailer charging system overcharge your battery of kept plugged in? I am going into my fourth summer with my current battery, and it is plugged in from early May to mid October and is only unplugged when I am hauling it. Battery is still strong as an ox. In the winter, I just put my battery in the garage and make sure it is not sitting directly on concrete. I know I should have a battery tender, or at least put a charge on it once a month during the winter, but I never seem to get around to it and I know that my battery will likelyrematurely fail at some point.

Also, check the water levels in the battery. If the water is below the plates in any cell, then your battery is likely toast.