Cost per usable kWh, payback and what actually drives the price difference.
Cost per usable kWh
Compare cost per usable kWh, not per nominal amp-hour — the lithium pack uses most of its rating, lead-acid about half.
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Payback and total cost over the life
The payback comes from replacements avoided, maintenance removed and downtime that never happens.
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Questions
Short answers to the ones that come up most.
Is LiFePO4 worth the price?
Over the life of the pack, usually — you buy it once instead of three times, and it needs almost no maintenance.
Why is one pack half the price of another?
Cell grade, BMS quality and how much testing was done before it shipped.
How do I compute payback?
Compare purchase plus replacements plus maintenance over ten years against the lithium pack plus its charger.