I'm NOT a battery expert by any means and have only ever used two with my 3 STs: Yusa and Ballistic. Here's some Ballistic Battery notes and a possible correction.
I ran a Ballistic battery in my STs for over 100k miles in 120 degree Death Valley Heat and Pennsylvania -2 to +5 degrees in February with never a problem. It was in the cold below 10 degrees for 3 days and nights and each morning when even the 5 wt synthetic oil was a bit thick and sludgy, the battery never quit, just kept cranking away until the bike started up!
Another attribute the Ballistic (maybe other battery brands have caught up) is that the on the shelf (or bike parked and off) discharge is nearly nothing. No need to maintain it with a charger. Unless there's something new about these batteries, I don't know anything about a "cell balancing charger" being required. On the rare occasion that I did hook up a charger (while installing farkles in the garage), I just used my plain old Delran Battery Tender Plus . . . no problems. Worked fine.
Lastly, the Ballistic battery is smaller and a lot lighter, an easy fit into an ST using the foam that comes in the box with the battery to make spacers.
FWIW,
Shuey