An interesting new product at battery hookup:
LithiumPower 12.8v 32ah 410wh LifePo4 Module w/ BMS
Drop in replacement small battery for a car? Perhaps. I'm a bit leary of the 32A max charge and discharger, but I assume that is probably continuous because that is 1C. For starting I think it would be fine. Two in parallel would be more ideal though.