I assume the 30Q went through 42 cycles during the testing (7 voltage termination levels tested with 6 termination currents each). Is it possible the capacity reduction was due to the fact it was a new cell (compared to the old Panasonic that would be already degraded due to the cycling)? Also, could the high voltage of some of the tests have anything to do with it?`
I sometimes get dizzy looking at a bunch of graphs, but those were indeed extremely interesting. Tons of work there…I don’t even want to know how long that took you. Thanks.
How to present the data and how much data to present is always an interesting challenge when doing my tests. I did try a couple of different charts and this was the best result. A table was completely out, it is mostly useless, except if you are in a spreadsheet and can visualize the numbers.
Sorry, I did not see you question before.
Usual a good reading would be between 4.15 and 4.19 volt. Look at the 4 hour voltage drop chart, somewhere between yellow and green dot (50mA-100mA) on the 4.2V yellow line.
For smaller cells you want to look between the blue and yellow dots (20mA-50mA).
Great test as usual, I would like to see the same test on nimh battery`s to see how end of charge voltage is related to capacity, like 1.39v vs 1.55v what is the capacity difference?
So, am I right to conclude that on a 18650, and our high powered lights that draw 5amps, <1 minute of turbo use will negate the difference from a almost full charge of 4.15, to a full charge of 4.20…?
Interesting test. Do you know the internal resistance of the batteries you tested? It would be interesting to see the correlation between that and the voltage drop after 5 seconds for the different currents.
Sorry but no, in this test I just did charges/discharges, there was no analysis of internal resistance.
The 5 second drop probably matched the internal resistance fairly well (not perfect), but the 4 hour drop included a couple of slower chemical reactions.
The internal resistance probably changed during the test, i.e. it increased slightly.