Tons of info about the Amp20 cells from the Ebike builders at Endless-sphere.
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Endless-sphere.com • View topic - A123 20AHr Pouch Cell Battery Build & Info Thread
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Li batteries are fussy about cell balance. You will want to check the voltage of each parallel group of cells carefully at first to make sure they all stay in balance. If one cell group goes too low it will lose capacity compared to the others and next time the battery is charged, it will go much higher, sooner, and puff gas. At least these LiFe cells don't usually catch fire like the earlier LiCo chemistry when overcharged. 3.6v per cell is very full for LiFe. Also, if low state of charge Li cells are hit with any sizeable charge current when they are below -5C temp they will undergo permanent plating and lose 20% of their capacity in one charge cycle.