Maximum temperature raise at different discharge currents: 1A:+0,3°C, 2A:+0,6°C, 3A:+1,3°C, 5A:+2,6°C, 7A:+3,6°C, 10A:+4,7°C, 15A:+5,3°C
This is low capacity D cells from one of the big brands and as can be seen on the photos the capacity is with a fairly discrete font.
The two cells matches fairly well and can deliver the rated capacity. At high current they are considerable better than AA cells.
Conclusion
These batteries do not have more capacity than AA batteries, but are better at high current. They feel very lightweight and my guess is that they contain a smaller cell inside.
A few years back when I built a lot of maglites with D cells, about the best D Nimh cell was the Powerex 11000mah from Maha Energy. Not cheap at all.
I guess you have to pay for the extra capacity. Too expensive for me to buy 4 to run in a mag. If your up for it HKJ it be nice see these tested. From what I have read they generally give more than 11000mah at low currents. Can’t find any hard data to back that up though. http://www.mahaenergy.com/powerex-d-11000mah-2-pack/
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Thanks for all your testing HKJ, valuable info.