When this voltage is reached the amperage of the charger declines rapidly and stays low for the final 15-30min of the charge. Most chargers are CC (constant current) / CV (constant voltage) chargers set at 3.6-3.65v. ![]() The voltage does climb from 3.4 to 3.6 over the final 90-100% SOC levels which should mean that if you see a reading of 3.4v you are at 90% charged. ![]() The flat discharge curve makes it difficult to determine state of charge (SOC) with a voltage reading alone since a reading of 3.3 volts could mean 50% charged or even 70% charged. The batteries in the pack are LiFePo4 chemistry and were chosen for safety (greater resistance to thermal run-away), flat discharge curve (3.2-3.3v for 70% or so of the charge) and longevity vs other lithium chemistries. I've been working with a pack of batteries from a DIY electric vehicle.
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