voltage drop
how much voltage drop is normal for a agm 12v battery or any battery if it is fully charged and connected to nothing?
Forum Discussion
tlaffourtit wrote:
the batteries I have i float at 13.5v. once I disconnect them from the charger; I am guessing they shouldn't stay at 13.5v but drop down into the 12v range? example I had the batteries floating at 13.5 volts for a couple of hours. then I disconnected the charger and took a reading of 12.96v across the 8 battery string. this morning the reading was 12.84v. my question is; it this normal? you responded it depends on the make up of the battery. is there any other information I could get from the battery label to help?
I would say that is quite normal. If you were reading the voltage at 13.5 volts while the charger was still plugged in & connected to the battery bank, that reading was from the charger, not the batteries. A 12.6 + volt reading taken directly from the string or individual battery indicates a fully charged battery. Unfortunately you can't check them with a temperature compensating hydrometer, since they are sealed AGM's
