resr said:
By the spreadsheet most of my cells are bad, but very few amongst new found were heaters (Samsung ICR18650-22FU at 66mOhm were, but LGCP218650 at 105mOhm were not heating up with stable charge holding).
The cells you checked and compared to the spreadsheet are not necessarily bad just not optimum performance. The spreadsheet was designed with >80% SOH in mind. It also has really nothing to do with heaters.
The heater argument goes like this:
Most heaters have high IR not all high IR cells are heaters.
The chemistry between different cell manufactures /cell part number andalso the cell application design in mind have a lot to do how cells react to different charging and discharging scenarios. It is best to read the manufacturers spec sheets if available.
So tell me the Samsung-22FU at 66m? what was the heat cut off? 45 C, 50C or more? If you did manage to get a mAh reading I'm sure it was in the 1500mAh to 1800mAh at the highest,68% to 81% SOH respectively
On your LGCP218650 I only have 5 tested in my database all with a SOH of 65% with an IR of ?63m?
1600mAh for a 2500 mAh cell is not a good result.
Can you share with us what your mAhresults where for theLGCP218650 with an IR of 105m?.
Case and point on IR:
Take a LGDAS318650 cell. This cell seems to thrive on high IRup to 80m? and it is still a solid performer.
Matter of fact I have had several with over 100m? test at ?100% SOH. Would I use it in my powerwall? Not a chance.
Flashlight you betcha.
Wolf