Look at amp-hour capacity. Lead acid chemistry allows about 50% capacity usage, where lithium allows about 80% capacity usage. One amp hour equals one amp used for one hour (pretty straight forward). Plus lithium discharges at constant voltage, where lead acid tapers off on voltage. All this said, lithium is better, plus the life span is much longer for lithium. Lithium batteries typically have BMS (battery management system) built into them. They are happy in a certain voltage range, and the BMS manages that. So, as long as the lithium batteries you buy have BMS, I say go for it. They will last longer and provide better power in the long term. 100AH gives about 80AH usage (lithium), where lead acid only about 50AH usage. Five years (lead) Vs 10-15 years (lithium) age.
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