The R manual suggests you can "zero" (as I call it) the AH counter by either draining the batt to zero or doing it when the batt is full. How stupid is that???? :) I suppose LFP guys could get away with draining their batts completely, but the rest of us have more brains than that.
Generally, all monitors will "drift" and need their AH counters reset (sometimes called "synching") when you know the batt is truly full. IMO it doesn't matter exactly why it gets out of whack such as for Peukert or inaccurate heat loss on recharge allowance, it is all the same what you have to do.
Good idea to compare voltage version of SOC with AH count version of SOC as described earlier to catch such "drift".
