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Airhead
Picard
Different cans of worms here. I have a Yuasa lead acid battery on the blade, but I delved into lithium with my ZX12R which suffered from overheating the actual battery itself. The battery was located inside the frame right behind the engine, where if it was hot and the bike sitting or moving slowly through traffic, chronic heat soak occurred. Often, in city traffic if I stalled the bike, it wouldn't start until it cooled down, which often took 20 minutes or so, but then it would start on the button. Nightmare! Lithium ion batteries are supposedly much better at operating in the sort of temperatures that were happening here, so I switched over. Unfortunately I sold the bike before I really gathered a lot of experience with it, but it had seemed to have solved it.
From what I've read though, lithium batteries will take very large charging rates, so it puzzles me why some of the voltage reg/recs aren't suitable, unless as you suggest they might not take the ripple.