If you are after weight reduction then all you need is the 28Ah at 600cca which is also a bit smaller than the listed one.
And the price is not 668 USD, its half that including shipping for the 42/60 Ah.
28Ah should be 25% cheaper as config is 4S2P instead of 4S3P.
You should be paying around $350 USD delivered(includes mains charger). And these LifePO4 cells last twice as long as lead acid.
But they do have issues such as temp range and needing special charger if completely discharged. You can't just jump start car if battery flat.
And do remember 20Ah LifePO4 battery is like 40Ah lead acid capacity wise.
Lead acid are a thing of the past.
Maybe you can source similar battery locally. But make sure quality cells are being used. And they can supply enough CCAs
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