Peter
By now I'm sure you have got your batteries charged but I will try to explain for others to maybe learn from.
For a battery to charge, the charger voltage must be higher than the battery voltage so that current will flow into the battery.
Usually, the larger the voltage difference, the larger the charging current. This is why most chargers that are set on 3.6 volts are connected to a battery that has 3.2 volts will only show enough voltage to reach the maximum current the charger can deliver at the immediate resistance of the battery (I wanted to say "current" instead of "immediate" but it would be confusing). This resistance in LFP batteries changes as the battery charge changes (and can be different between batteries). This is why we have to have smart battery chargers to keep changing the charge voltage as the battery voltage increases.
If the actual battery voltage while being charged is 3.20 the charger and or display might only show 3.30 (or similar), but as soon as you turn off the charger the battery voltage will drop back down to near actual voltage then after about an hour it should be actual "resting" voltage.
As the battery voltage goes up while charging, so does the charge voltage but the charge amps stays the same. Then when the actual battery is close enough to 3.6 volts, the charger display should stop on 3.6 volts and then as the battery is charged more, the charger lowers the charge amps, and when it gets down to 0.1 or 0.2 amps the battery is fully charged.
When charging a LFP battery from discharged, the charge voltage will be between 3.1 and 3.35 for a long, long time compared to before and after these voltages.
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