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Just received mine and find that the capacity on both is only 1600mAh on a 1A discharge test.

Has anyone else found disappointing capacity on these or did I just a get some duds?

Lots of the manufacturers like to exaddurate their batteries capacities.

I am not an expert with lithium ion cells but MANY years ago when I was in school for electronics most manufacturers would rate batteries at something like a 20 hour discharge rate.

example: a 1000mah battery would provide 50mA for 20 hours it would not provide 500mA for 2 hours, the capacity would drop as the discharge rate increased.

I know a lot of manufacturers do overstate capacity, but I also wonder if a lower discharge rate would get numbers at least closer to claimed capacity.

as I said I am not an expert on lithium ion cells, so it is possible that they don't suffer from this condition or not as much as the older cells I dealt with, just a thought.

I bought this SKU a few times back when it was around $11 and it performed pretty close to rated in field tests with a buck/boost driver in a single-cell cree light known to pull an average of 1.2A. It got a few minutes past 2 hours with dropoff in the last ~15 minutes before the protection circuit cut in, so we estimated a 1:50hr run giving at least 2200mAh capacity.

I really hope this isn't a reduction in production quality that coincides with the price drop, because I just ordered a new pair recently.

Lead-acid batteries are indeed normally specified by their capacity from a 20 hour discharge. They suffer a lot from the Peukert effect, which means they have much less capacity when discharged faster. However Li-ion cells aren't affected anywhere near as much.

Just got mine in the past week... Every one of them is coming up between 1000 mah and 1700 mah.
Very disappointed in these.

Using the Mystery Charger / Discharger sold on DX.