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I am attempting to re-balance a pack after a 'low-voltage event' which totally killed one cell in the pack. I have bypassed the completely dead cell, and am attempting manual re-balance before using pack charger.
I have been using a 'revolectrix powerlab' 1000watt single cell charger with luck in the past to bring cells up to a set voltage, and terminate charge automatically... which got the cells all pretty close initially, needing just a little fine tuning with a resistive element when the cells were new.
HOWEVER, this time around, there are a number of cells that just don't seem to hold the charge nearly as well, and even with repeat charges to the set voltage, they 'settle' to a lower voltage than other cells... and when I try a pack charge the cells are obviously out of balance with a number of cells heading up to 4v while a few don't seem to keep up.
I suspect that some cells are damaged internally, perhaps having vastly higher resistance, or 'dendrites', or plating or something....
My question to the group is:
when a number of cells become 'unbalanced' with others in the pack, and do not remain balanced after repeat single cell charging/discharging to a set voltage... is there any way to recover them, or are they dead?
I have been using a 'revolectrix powerlab' 1000watt single cell charger with luck in the past to bring cells up to a set voltage, and terminate charge automatically... which got the cells all pretty close initially, needing just a little fine tuning with a resistive element when the cells were new.
HOWEVER, this time around, there are a number of cells that just don't seem to hold the charge nearly as well, and even with repeat charges to the set voltage, they 'settle' to a lower voltage than other cells... and when I try a pack charge the cells are obviously out of balance with a number of cells heading up to 4v while a few don't seem to keep up.
I suspect that some cells are damaged internally, perhaps having vastly higher resistance, or 'dendrites', or plating or something....
My question to the group is:
when a number of cells become 'unbalanced' with others in the pack, and do not remain balanced after repeat single cell charging/discharging to a set voltage... is there any way to recover them, or are they dead?