I can only look back on the already second year regular battery operation of my portable radios with these batteries. I need for my stone age device (star-160 recorder from GDR production) 6-cell type D, and these last for about one year. The device plays several hours to two to four days a week, namely radio and cassette player. Meanwhile, for the third year running, again with batteries of this type, and suppliers so far without problems. This shows that the cells are not superimposed, it is no B-goods or other committee and there seem to be no plagiarism. Compared with other, much more expensive purchased premium brand they are no worse or short-lived. Therefore: buy recommendation from me.