I understand they are quite reliable and won't lose charge when not in use, even for extended periods.
I'm trying to prevent the situation where say, uuuhhh, I leave the GPS or I don't turn the ignition off properly, (don't ask me how I know these things) and I'm in the middle of nowhere, in deep sand (can't bump start).
Even if I'm at home and the battery dies; it seems to be generally accepted that lithium batteries should not be jump started. I read somewhere that it could take days before a jump started lithium battery starts acting up, overheating, and potentially starting a fire. Something about copper plates fusing and shorting out. With the history of lithium batteries igniting, it's not a risk I want to take.
Plus, I would rather spend $100 - $200 on a good non-lithium battery than the $500+ on replacing the standard lithium one. That price is insane.
I am mostly looking for the peace of mind that I can safely jump start my battery without concern about losing the bike to fire, however small that risk may be.