I highly recommend this one. Starts my ST1300 like no other battery ever has, been in there two years, no issues:Been awhile since I checked or posted on the Scorpion battery life documentary.....Just had one crap out that was installed in Spring 2014. The one prior to that ran from 2010 - 2014.
So, it seems that "3 seasons" (as we are in Michigan here) is about all one can expect from the Scorpion battery.....
Now we look for a replacement.....
https://www.amazon.com/dp/B017DX6V2W/ref=psdc_404722011_t3_B00DCXIJJG
Just be aware that lithium batteries have about 1/3 the discharge capacity as their lead acid counterparts, and parasitic drain will discharge them three times quicker.