Purchased this after buying the 500.I've been using a Deltran Battery Tender, a Dewalt trickle charger, a Schumacher 6v/12v Maintainer simultaneously and all have worked just fine. I wanted to try the Optima 400 unit just in case any batteries I have go so low that they come across as dead and no longer able to be charged (by other units) as well as for simple tech curiosity so I have one of those coming after Christmas. I ordered another Deltran unit for the Honda generator I just purchased as well. I see they changed SKU's around and that some retail outlets are going for the throat at and above $100 for it. I found an Amazon dealer that had some in the mid fifty dollar range and it just showed up. Very happy with their quality.
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Not only needed to maintain the 2020 GT500 and 00R but needed to plug in the mower too and there’s room for another car.