NEVER Discharge Lithium cells to 0V!
If you have done so, and managed to get them charged up again, you're just lucky.
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The lower discharge voltage for LiFePo4 cells are normally 2.5V, and never below 2.0V. If a cell are below 2.5V, one should normally trickle-charge the cell until it reaches 2.5V, then apply full charge.
And fyi;
Most LiFePo4 cells have an end-of-charge voltage at 3.65V max; preferably 3.60V (You'll lose 2-3% capacity by skipping those last 0.05V, but the cells will last much longer.).
So to test the capacity of your cells, charge them up to 3.60/3.65V, and discharge them down to 2.50V with a known load, then you have your capacity.
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For those of us that are lucky enough to have the iCharger (I got the 1010b+), there's a separate discharge-charge cycle program there.
Also, to get the internal resistance for your cells, press and hold the stop button for 2 seconds until it beeps, and then press the left arrow button.
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Edit:
I guess the specified internal resistance are measured when the cell are fully charged.
My experience says that a cell that are worn usually shows a greater difference in the IR when discharged versus charged, compared to a good and healthy cell.
I do not know the spec. IR for your cells, but I have some 3.3V/10Ah cylindric cells here that have an IR of around 6-7mOhm when fully charged (3.60V), and around 20mOhm when discharged (2.50V). These are good cells that I get in excess of 11Ah out of when keeping them inside the limits.
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