I don’t say that these cells aren’t worth being considered.
I did a quick research to be able to judge this topic a bit better and I have to admit these things look good on the paper (Wikipedia).
But when I calculated the price for different LiFePo cells in a German shop and compared it to Samsung Q30s I am more at 40-60% higher prices (depends on the cell type, very large capacity ones seem to be cheaper in relation). And the weight is more than double:
5Ah cells: 32 €/Ah, 420 g/Ah
8Ah cells: 27 €/Ah, 446 g/Ah
10Ah cells: 26 €/Ah, 448 g/Ah
15Ah cells: 28 €/Ah, 424 g/Ah
Samsung Q30: 18 €/Ah, 196 g/Ah
So can you give me a source for cheaper cells? And is the manufacturer as important as with Li-Ion cells? What are good manufacturers then? I read about A123.
Edit: the above calculations are assuming 14S for LiFePo and 12S for the Q30.