For what you are using the battery for, I don't think you would need a 100ah battery.
What is the ah rating of your current lead acid battery?
When you switch the lithium, most manufacturers will say you can go with about 1/2 of the ah rating.
On Amazon, I stay away from the knockoff brands. Sometimes it's worth it to go to a place you can trust, that can give service, advice and quality products. GPS Central sells Dakota Lithium. They cost more, but you likely wouldn't be on here asking about the quality of the battery or the seller.
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