I ended up getting an 8 cell antigravity since I figured that if it didn't work I could use it on my smaller bike. I've had it for two weeks and it works like a champ, even in the middle of the summer in Texas. No hesitation starting my Sportster.

 

Glad the 8 cell works for you....only time will tell. If you have parasitic draw, use a lithium battery tender. My AG holds charge pretty well even with parasitic draw so rarely place it a tender unless I don't plan to ride for prolong periods.