The real danger is an accidental short in your wiring that will turn the battery into a road flare / smoke bomb.
I have burned up a few lithium batteries (in a Lab) and I know it would make a real mess of your bike.
The saved weight does not make a difference on a big bike.
Different chemistry between the o e you burned up in the lab and the bikes.
Dead short, BTDT. Dropped a bus bar across the terminals of a 20 am/hr battery while disassembling it. The bar turned a nice bright shade of red and orange as the battery discharged at a 200 amp rate.
Puncture a battery is a danger? Yes, on some lithium, not LiFe. Again, BTDT! Sliced one open on a tablesaw, accidentally of course. End result was the same. No danger. Only damage was to the wallet.
I like 'em. Weight is an advantage but I really like the deep cycle capability (thousands) and because they keep cranking until their last breath. Two things lead acid can not do, not even close.
First one I built was a bigger one, for the ST to do double duty as a power supply when I camp. It only came out of the bike because I wanted the cells for another purpose.
In its place is a smaller model (bought pre-assembled) and it works just fine. Slows the crank a little in colder months but started my steed just fine at -5° F.