icecube57 wrote:That seems to be the magical number around 4AH. I dont think its because of age. They seem to display the same behavior as SLA. Getting about 60-70% of capacity.
I cannot believe that is all they can do. Many of these cells should be having near-new capacity when they are pulled from accident vehicles.
A charge range from 20% to 80% DOD leaves 60% usable without deleterious effects on the cells longevity.
That means 6.5Ah - 1.3Ah = 5.2Ah should be what can be sucked from the cell at 20% DOD if discharged to 0% DOD on a CBA2.
One should not drain it past the 80% DOD on a regular basis, though.
I believe that the NHW20 cells I bought are either damaged, or they need to be charged with compression.
And that is happening now. We shall know in a few hours how much charge I can get out of a NHW20 cell charged with a power supply set to 8.7V max and 3A max when the cells are compressed between wooden boards to limit swelling.
If the 8.7V do not result in cell warming, then I might try a higher CV charging setting.
The NHW10 cells I am testing have near-nominal capacity, barely different between 6.5A and 0.7A discharge rates. At 19A (maximum my CBA2 can do) I get a little bit less out of them.
I really doubt that Toyota / Panasonic reduced the quality of their third generation cells compared to the first generation!
There is always a way if there is no other way!
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