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You need a pack that under all conditions will cope with the max demands of the motor controller. If you ave a decent pack of a high Ah, its never under stress, that means lower heat, that means longer lif. When not being pushed to the limit a pack will hold its voltage up, if a too small pack is pushed the voltage drop will be much greater and more quickly show up poor cells. This is especially the case with cheaper lifepo4 which generally are not as good at holding voltage as Li Ion (Nickel, Manganeese, Cobalt ) So if you go for cheaper Lifepo4 always have enough Ah or more than the minimum.