I am just wondering whether the Lith batteries when new take a few charges/discharges to get to their advertised milliamp rating. Storage before sale may affect the batteries as liths drop approx 10% a month (so its said).
Another tester said that the 400mah battery reached about 360mah...so...seems its a lucky dip really.....
Looking at the video the cells appear to be 420 mah rated. The battery also has a protection circuit that prevents over discharge among other things. My experience with the protection circuits has been that they can vary in the actual low voltage and high voltage cutoff points. Depending on the cutoff point you may not get the full rated mah in usage.
Isn't that exactly what the tester is telling us? The first two brands reach 98% of rated capacity, the others show larger differences.
BTW, don't be fooled by these 6F22's being advertised as 9V blocks. They aren't. Their operating voltage is ~7.4V, what one expects from a 2S LiPo. But compared to the OK cell, there is no ripple in the output, and they have double the capacity. What counts is the energy available, which is ~2.9Wh for the OK, whereas the EBL has ~5.9Wh. Energy is VoltagexAmpHrs! The 2S have another advantage - they can be safely loaded with 1C current, which is 0.6A. I doubt the stepup regulator in the OK is capable of that.