3.0V is not at all considered dead for a CALB LiFePO4 cell. Nominal, or
average voltage is 3.2V, 20% discharged would be at about 2.4-2.6V. Max
recommended voltage is 3.6V. I've been using a CALB pack for 8 years, and
routinely drive the cells down to below 3.0V.
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