I've been using the following tender for almost 10 years now. My Z sits for the entire winter in the garage hooked to it. My OEM battery lasted almost 9 years, which I attribute to this tender and my seasonal driving habits. I've never disconnected the battery when charging with this. It comes with a lead you can attach to the battery that allows you to quickly disconnect it and go. I highly recommend it, especially if it isn't going to be your daily driver.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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~Rob
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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