I bought these batteries thinking they were the best - what a disappointment !
Firstly, they self-discharge significantly within a week or so.
Secondly, they are way-below the capacity claimed - coming in at between 2300 and 2500mah according to my tests.
Sent them back to Ansmann, who claimed they were 'within specification' (which apparently is above 2450mah), and who were either unable or unwilling to replace them with some which actually were 2850mah. Spoke to Ansmann's UK MD about it - he said he 'had seen' a battery with a 2800 capacity (!?) but that they vary between batches, and the latest isn't a good one. He justified the apparent mislabelling on the basis that "all the manufacturers do it". Shocking!
Well not all the manufacturers do it. I've found uniross batteries have a capacity at or near what they claim, and hold their charge well (even the ones not labelled as low-self-discharge). And what is more, they seem very reliable and don't deteriorate noticeably as the years go by.
So if you want high capacity AA's, I'd suggest Uniross 2700's - hold their charge well, have a higher capacity than the Ansmann 2850's (in my tests), and much cheaper !