IMPORTANT: The Ansmann batteries are fast rechargeable. However, it should be noted that in some sets of four copies are going to need some more longer hours for the first charge, as the other three. That's just a good charger, in my case a Ansmann Energy 16 detected indicating the charging status of each battery separately and a refresh mode has (maximum 12 AA or AAA batteries + 4 monoblock can be loaded at the same time).
Negative experiences, as they are read here in some cases, could thus be justified that the battery sets with a simpler charger without single ad per battery will not be fully charged and thus not achieve a set of 4 their full potential. I note that the second or third charging little more timing differences in the individual batteries are present if the initial charge was once performed correctly and virtually all are fully brought to life. After several months of experience with the Ansmann batteries they get five stars.