I would say its safe to say if one is concerned about weight, lithium is king.
For me, my first and only choice is the 500 AMP Yuasa simply because it has a much greater (stores much more energy) reserve capacity.
The Lithium has 6 A/H and the lead acid Yuasa has 32 A/H that's over 500% more reserve. Since I have a bike that is as heavy as a tank, I prefer the lead acid.
AS far as cranking AMPS its another "fluff" number from a lot of motorcycle battery sellers. Bottom line the Yuasa is rated using a standard accepted rating method of CCA which is 500.
This lithium to compared has a similar rating of 250/275
I do understand this is for a softtail and I am talking Road King
So the HD lithium for a Road King has 8AH of power and roughly 350CCA (translating HD non standard method of rating the battery)
The Yuasa has 32AH of power and 500CCA.
Its all good, if weight is king and not cost. Because the lead acid is much more powerful at lower cost.
Technology is cool, its whatever one looks for what is good for them.
I only point the above out for those talking about power, as they need to look at the real numbers and the unorthodox way they rate these batteries which makes then sound as powerful as lead acid batteries of which many like Yuasa use accepted standard ratings.
This also goes for some lead acid batteries sold as motorcycle and powersports, its like the Wild West with misleading information, at least Harley Davidson FULLY discloses this information and its easy to compare.
https://www.harley-davidson.com/store/lithium-life-8ah-battery
^^ the third photo on this page fully discloses the HD battery ratings.
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