Has anyone swapped their lead acid out for lithium-ion?

LIGHTWEIGHT Because of 3x higher specific energy and energy density numbers, Lithium batteries are small & light.
SUPER DEEP CYCLING Depending on discharge depth, a Lithium battery can do 5x as many cycles as lead acid. It can handle 80% depth of discharge (DOD) while lead acid handles 50%. If replacing a lead acid battery under two years old due to deep-cycling damage, you'll save in the long run switching to Lithium-ion.
FAST RECHARGE Lithium batteries can accept charge current up to 5x faster than lead acid batteries. Charge efficiency is about 75% for lead acid compared to 97% for Lithium, which means less recharge time and alternator strain.

No need for venting, fully sealed!

Even at double the cost I'm considering it.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!