A lot of power, but with a deficit (according to Stiftung Warentest)

The black Eneloop I use mainly for my flash. Ansonste I put on lower capacities to 2000 mAh. One reviewer has already written that the black battery according to Stiftung Warentest Issue 7/2014 are very sensitive to a rapid charging and capacity crashes on harrowing 222 mAh to 200 cycles. The other test candidates with similarly high capacity collapsed, the best "only" around 50%. With the Test score 2.4 black Eneloops landed in 5th place out of nine test products. (Test winner was a Mingno AA cell 2000 mAh.)
It offers the opportunity Eneloop, however, was that the capacity was still, after all, after 90 days in the heat at 78%. Three other samples with similar high capacity landed at values ​​around 20%!

I myself use rechargeable batteries for many years and have learned early on that fast-chargers for rechargeable batteries can be toxic. According to Stiftung Warentest died when tested in 2005, more than a third of the batteries; but this time not a single. Nevertheless, I have remained faithful to the slow loading with low currents. Mostly I have the time, because I always have a rechargeable battery pack in reserve. Fast charging means according Warentest incidentally that the charger fills the batteries in two hours; slow loading of the process takes four hours.

++++ My conclusion: I think the black Eneloop batteries and their capacity / Power continues to be convincing! One star deduction is available for the fast-charging shortcoming, which was communicated to my knowledge, not officially. Therefore, one should refrain from a fast charging possible and let the filling (at least) four hours.
It was interesting nor the footnote that the black TEST Eneloop samples were classified as discontinued models by the manufacturer.