Battery charging

So my wife and I purchased our 03 1950 a few months ago and are still working the bugs out of it. I was told that if I don't disconnect the battery when I plug into shore power that I will over charge the battery. Is this true? If so how do I go about wiring in a batter tender or something along those lines that will keep my battery from over charging and I don't have to remember to disconnect the battery every time I plug in.

Thank you in advance.