Battle Born Victorious

[JunglePower]

On some chargers, they go into a sort of standby mode after xx hrs to prevent issues in case something goes wrong.

I am not sure if it is the right thing to do or not, but after a day or so on a charger, I will unplug the charger, let things setting for a few hours - and plug it back in. Seems to help on my charger.

They haven't been on the charger since the point where all were holding at 14.6 individually. I just simply tie three at a time in parallel and let them rest. I have multiple pages of "logs" taped to each battery to record their SOC each day.

 

[HarryN]

They haven't been on the charger since the point where all were holding at 14.6 individually. I just simply tie three at a time in parallel and let them rest. I have multiple pages of "logs" taped to each battery to record their SOC each day.

I have never seen one rise in voltage by itself not on a charger. It could be normal but I just have not seen it.

It might make sense to put that one in a sand box and ask BB what this means if you believe that the number is real.

I don't know the exact details of how their BMS works on a cell voltage basis. Probably I should read more about that detail. I have only relied on the balancing to happen on the charger. Would love to see your voltage plots sometime if it is not too much work for you.

I am very confident in my ability to do comparative measurements - that two batteries are "the same" to within 0.1 volts and even perhaps +/- 0.01 or 0.02 volts right next to each other.

I am not sure if I trust my technique and meter to be that good day to day - it might be - I am not sure.

The rising voltage is unsettling but I am not an expert.

 

[JunglePower]

I have never seen one rise in voltage by itself not on a charger. It could be normal but I just have not seen it.

It might make sense to put that one in a sand box and ask BB what this means if you believe that the number is real.

I don't know the exact details of how their BMS works on a cell voltage basis. Probably I should read more about that detail. I have only relied on the balancing to happen on the charger. Would love to see your voltage plots sometime if it is not too much work for you.

I am very confident in my ability to do comparative measurements - that two batteries are "the same" to within 0.1 volts and even perhaps +/- 0.01 or 0.02 volts right next to each other.

I am not sure if I trust my technique and meter to be that good day to day - it might be - I am not sure.

The rising voltage is unsettling but I am not an expert.

I took the last three that were not evenly balanced,13.7, 13.6 and 14.1 and paralleled them and got 13.8. Connected a 10 amp 12v pump for one minute on diagonal poles and voltage went to 13.9 so I'm gonna leave them connected for a day.
My logs are just scribbled values thru the days for each battery, nothing worthwhile sharing as only I understand what I wrote.