Nice!
I've thought about LiFePO4, not only for the 12V, but also for the hybrid batteries in my Toyotas since there seems to be a growing group that's having success replacing every block of NiMH cells (12 cells) with 5 LiFePO4 cells.
But I think it's too cold where I live for LiFePO4 to work properly without damaging them.
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