Mine sat weeks in the freezing cold. It wasn't expensive at all, cheap in fact. I think if I rode more it may have held the charge better. If the volts are lower than the norm like that again I'll charge it before trying to do anything. Even if they can be warmed up with some drain load.I wouldn't bother hitting start. I have a volt meter and saw it wasn't fully charged. I wanted to see what it would do. I found out. Not much. Lithium is more all or nothing rather than slowly getting weak so once it started to crank slow I got right off the starter. I didn't try any coaxing for fear of hurting the start system like any other weak battery will.Technology for the sake of technology rarely pays off... at least at first.
AGM batteries in motorcycles are proven and reliable as long as you are buying QUALITY batteries.
As finicky as Triumphs have shown they can be about starting voltage why screw around and experiment... unless you just like to and have more money than sense.