I discovered this brand battery when buying a headset (wireless) Sennheiser. My satisfaction was so huge as to the autonomy of the latter (+ 24h) I bought this lot of batteries to determine the swapping of batteries and never be short ... These batteries do not discharge without using even leaving in appliances (off) ... After the comparative nor Duracell, Energizer or do compete for autonomy !!! Supplied in a small plastic box, avoiding contact polarity of each battery ... I strongly recommend this brand deserves, for my part, to be widely known !!!