I’m not sure if the ‘help’ thread is the best place for this info, but it might be of help to someone, so…

*EDIT: Keep in mind that both the discharge cutoff voltage value and discharge current / rate used in the referenced cell manufacturer’s capacity ratings is unknown, so direct comparisons of this data with those ratings is not practical.*

In the course of doing some cell testing in the past couple of weeks, plus the initial checkout of a new ‘charger/analyzer’, some data I noticed in my notes may be of interest to some, so I’ll share it:

The 2 devices in use were / are:

- Opus BT-C3100 V2.2
- SkyRC MC3000 FW Rev: 1.15

I ran discharge tests on 4 new examples of NItecore NL-166 , protected 16340 cells which have a rated capacity of 650 mAh. Discharge current used was 1.0A, and discharge cutoff voltage was set to 2.8V on the MC3000, and the non-configurable default value of the Opus is the same (~2.8V).

The resulting capacity (in mAh) indicated by the MC3000 was:

Cell #6 - 671

Cell #7 - 677

Cell #8 - 677

Cell #9 - 666

The next day I ran the same test on the Opus, with the following results:

Cell #6 - 718

Cell #7 - 709

Cell #8 - 741

Cell #9 - 725

The next day I re-ran the test using the MC3000, with the following results:

Cell #6 - 673

Cell #7 - 679

Cell #8 - 682

Cell #9 - 669

Those results would seem to indicate that the capacity results of the Opus are, in this particular case, ~7.5% higher than those of the MC3000.

It also indicates that the change in average measured capacity (per the MC3000) between the first and third tests was minimal / negligible (~ +3mAh, or +0.446%).

About a week later, I tested 4 samples of NL-169, a newer version Nitecore protected 16340 cell with a rated capacity of 950 mAH using the MC3000, with same parameters as previous tests. Those results were (in mAH):

Cell #1 - 905

Cell #2 - 913

Cell #3 - 911

Cell #4 - 897

Following that, I re-ran the test on the same 4 cells, but this time I used a discharge current of 0.5 A (rather than 1.0A used on all the previous tests) with these results:

Cell #1 - 925

Cell #2 - 938

Cell #3 - 940

Cell #4 - 924

Although the effect of different discharge rates on measured capacity is easy to determine from looking at any proper manufacturer-provided discharge graph, this just provides a real world data point I happen to have in front of me. This 50% reduction in discharge current appears to have increased measured capacity by ~2.8%.

Just FYI. As you were…