I have went through the GAMUT of batts for Motorcycles from uber high compression V Twins to the 8.7 to 1 easy spinning R3(IMO) and the best battery I have found (I have spent 350 for Shorai LiFePO4 to the 100 ish for Yuasas) and IMO the best AGM batt made in the USA is made by East Penn Mfging in Pennsylvania and goes by the DEKA brand or the Big Crank Brand. This company makes the OEM batts for HD and I was shocked at how much better the Deka brand batteries build quality was than the Yuasa, Interstate and etc.....
AND...They make the DURALAST GOLD ETX20L sold at autozone..Same as the Deka or Bigcrank and you can get 20 per cent off..
Check Amazon's review of the Deka ETX20L ..56 reviews...5 star
and like TRIICK said leave it on a Float tender.