The batteries make far what they should: provide "juice". They do that reliably and well. Whether they can keep the energy the "Duralock" vow, 10 years, can truly hold, I can now, of course, too early to say - probably I did not lie so long unused.
But in any case, I use the Duracell prefer, because the hares advertising is not window dressing, these batteries last really long.
The AA (LR6) batteries do I need for my weather stations (I have a stand in every room). Here I am very pleased with the batteries, because they really hold twice as long as the cheap, who were in it previously. That is why I no longer cheap batteries come into the house.
In a battery pack of 12 costs about 60 cents. The LR6 with power check are slightly more expensive. Who does not need to check that comes with this one away güstiger. By the way: the packaging is resealable, so that the new batteries rumkullern nowhere! I think it's practical!
Point deduction is only available for the high price and that is not on every package a "best before" date is printed (by the 10-year warranty would be the already important!).