I used simple statistics to improve capacity testing by +/-65mAh

Travis Watson

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Aug 6, 2017
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And I made a video about it ;-)


TL;DW - compare the average of all cells tested to the average of only those tests in a particular bay. This will give you an amount you should offset the tested mAh capacity. Starting voltage doesn't really seem to matter, assuming it's in a reasonable range like 4.15-4.25.
 
Nice work. I though think you then need to add another parameter and lower it a certain % on each cell. The Opus is generally off by up to 100mAh + so in the end your values should go down (Compare to high end iChargers and other RC related chargers/testers)
 
daromer said:
Nice work. I though think you then need to add another parameter and lower it a certain % on each cell. The Opus is generally off by up to 100mAh + so in the end your values should go down (Compare to high end iChargers and other RC related chargers/testers)

That's a good point; I also noticed that the test varied a lot with discharging current.

However, would that really affect my matching? The proportional difference between the cells would be the same, right?
 
I'd love to see somebody figure out how to correct the difference in voltage readings for the C3100's. One of mine shows a .04v difference from the others. Travis said in Discord that the voltage doesn't seem to matter much, but when a charged cell reads 4.16v in one charger, but 4.20 in another, it sure feels like something that needs to be adjusted.

When capacity testing, I've taken to using whichever charger / bay gives me 4.18 to 4.20 volts for a given cell. (the most common voltages I'm seeing)
 
Travis: for pure sorting then the real number doesnt matter much no :) Thats how I run and make my packs and so far it worked fine.
 
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