I went with the ANTIGRAVITY ATX30 in my 2016 Slingshot. It also has the restart feature. I've had very good luck with Antigravity Products. ( I AM IN NO WAY CONNECTED WITH A.G.). I just really like their products. They require a dedicated Lithium battery tender (you probably know that already). There is also a ATX30 with a hotter CCA without the RESTART feature.