I have not experienced any other battery with such an extremely long service life, be such. B. is ideally suited for the Game Boy or other devices that need a lot of energy. "High Energy", a battery that their money is well worth it !!! (What good are a tens of other batteries that conk out after a short time and you ultimately need as many batteries, that the batteries are actually cheap but expensive when these batteries ?! So I swear to this battery!)