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LFP has much higher energy density (100 Wh/kg) than lead acid (30 Wh/kg). The lower weight and size is big advantage of LFP.

LFP also can be fully discharged while lead acid can only safely go to 50% which means more battery for same capacity. LFP is limited to 80% charging to preserve lifespan but still comes out ahead.

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Poster said power density, and I don't really believe theyre' right (see:a123 batteries, and now there are plenty of competitors)

However that's different than you're saying, which is about energy capacity.

I believe they are mistaken because many lfp replacement batteries have BMS units that are usually the limiter. But you can also buy lfp starter batteries

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