I have the EZ GO ac, I called the company [not local dealer] about the car sitting for a long period of time...They told me never use a battery tender, leave it unplugged, unhook the negative battery cable where it grounds to the car. When you get back just hook it back up and charge it...Done this for several years never a problem...As far as leaving it plugged in, if you get a lightening strike it would fry your charger and the cart and always the possibility of the charger malfunctioning and burning down your house.
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