Hey guys,
When a pack finishes charging it usually (even when the charger is disconnected) balancing high cell rows down by bleeding them slowly.
I've had this way out of balance pack, it didn't charge all the way up so I connected it to the charger and left it connected for about 3 days and it was perfectly balanced again.
Now I have this pack which is out of balance (16S charges to 65.9V) and it's connected to the charger for 24 hours now and it hasn't moved even 0.01V.
It's pretty logical to think that some chargers when the light turns green just go on idle and never pass any current after that so the only balancing that is possible in this scenario is bleeding down but never raising up low cell rows.
From experience, the bleeding down happens at the end of the charge whether the charger is connected or not and it never fixes large differences, it stops after a few minutes, sometimes an hour or so, so if there is one row at 4.2V that stopped the charge and the rest of the pack is at 3.9V then that 4.2V will never be bleed down to 3.9V.
When a pack finishes charging it usually (even when the charger is disconnected) balancing high cell rows down by bleeding them slowly.
I've had this way out of balance pack, it didn't charge all the way up so I connected it to the charger and left it connected for about 3 days and it was perfectly balanced again.
Now I have this pack which is out of balance (16S charges to 65.9V) and it's connected to the charger for 24 hours now and it hasn't moved even 0.01V.
It's pretty logical to think that some chargers when the light turns green just go on idle and never pass any current after that so the only balancing that is possible in this scenario is bleeding down but never raising up low cell rows.
From experience, the bleeding down happens at the end of the charge whether the charger is connected or not and it never fixes large differences, it stops after a few minutes, sometimes an hour or so, so if there is one row at 4.2V that stopped the charge and the rest of the pack is at 3.9V then that 4.2V will never be bleed down to 3.9V.