Originally Posted by mrforsyth
This is what makes no sense to me. A pack that is balanced during a discharged state will then show an imbalance when the pack is charged if all cells are not carefully matched. This makes the balancer work a lot harder when the pack is charged and may greatly extend the charge cycle.
Our planes, cars, boats, etc., do not balance during discharge as doing so can create more issues than it solves.
I guess the simple way to avoid this is to simply not plug in the balance tap during storage discharge, or use another means altogether...
"A pack that is balanced during a discharged state will then show an imbalance when the pack is charged if all cells are not carefully matched"
Why would this be? Cells that are stored balanced with have less work for charger to balance. Balance is only going to kink in toward the end anyway as max volts is reached and cells will seek level on the bus getting to that point.
They don't give specifics, but by my read it is not doing careful balance on discharge, only looking for major swing that can point to an issue with a cell. But I could not find any +-V margin that it looks for.