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Yup. What Keoke said. "Battery tender" is one popular brand name that comes to mind. If the battery charger is not an automatic float charger, you can easily do more damage to your battery than good if you keep it plugged in.
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/ubbthreads/images/graemlins/iagree.gif Like fry the battery, the battery box, the car, the garage, etc., holding it all. The charger in my Catalina went bad on me one winter, and only by luck did I go to the marina and notice the smell of the batteries bubbling away the last of their electrolyte. 'Twas my own fault for using the stuff I'd inherited from the DPO instead of following my insincts and getting a better charger. Same could happen here with the wrong charger on board.
R.