tatasal
(tatasal)
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The S4’s ‘Repair’ mode is for cells that are heavily discharged that the charger will sense it first then put a miniscule amount of charging rate. For example, lilo cells that were discharged 2.5v or below etc…it also has the ‘repair’ function for heavily discharged nimh.
The Cap (capacity) mode is for determining the cell’s capacity by going through the Charge-Discharge-Charge cycle, showing the capacity in the display after the Discharge portion.
Edit: I have not actually tried the Repair mode but the manual says one of the ’Repair’s function is to activate a protected cell’s tripped protection circuit.