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pdove had a similar incident which prompted the troubleshooting and repair of the TCCH/Elcon charger thread.
Did your pack ever get overdischarged down to a very low level, or hit any sort of low voltage limit?
i consider Full voltage as 3.33 volts per cell for that chemistry--and feel that there is no benefit to charge higher.
It sounds like your charger is set to charge to 156 for the pack, but the CV stage cutoff current limit was never reached to turn it off. This could happen in a pack with one damaged cell, and if held long enough will damage other cells, such as you have experienced.
You may be able to use the tiny push button on the control board to adjust for lower voltage, depends upon what table was used to program the button settings, and if this is listed on the charger label or tag.
Did your pack ever get overdischarged down to a very low level, or hit any sort of low voltage limit?
i consider Full voltage as 3.33 volts per cell for that chemistry--and feel that there is no benefit to charge higher.
It sounds like your charger is set to charge to 156 for the pack, but the CV stage cutoff current limit was never reached to turn it off. This could happen in a pack with one damaged cell, and if held long enough will damage other cells, such as you have experienced.
You may be able to use the tiny push button on the control board to adjust for lower voltage, depends upon what table was used to program the button settings, and if this is listed on the charger label or tag.