I started with a 14aHr and was upgraded to an 18aHr on my Tiger. Sold the Tiger but kept the Shorai. Shorai send me a new 21aHr free complete with shipping both ways. Just ran the GS through three cold WV mornings. It doesn't like the cold. It will crank but you better not have any other issues going on. Some folks said it made their bike start stronger than the original AGM. Not mine. I think the original spins the bike up quicker hot or cold. Considering all the tools and crap I carry on the GS, the weight savings is not a valid advantage for the Shorai. Only positive thing I have to say is having two batteries isn't a bad idea when you keep one on trickle in a warm place all the time.
Old, but not Dead