I have a Victron Smart IP65 charger 230v 12v/7a, 45Ah AGM battery, and Smart Battery Sense. Today, after another power failure and the battery working for 4 hours, I put it to charge. After 3 hours I saw that the charger reports that charging time is 2 hours but the data in Smart Battery Sense was different. You could see on the screenshots below that Battery Sense reports that the voltage was up at 13:10 and still high to ~16:10.
Any ideas where 1 hour is lost? Thanks for the advice!