I bought such a battery already about 6 years ago, in order to revive my PC. Older motherboards have firmly soldered to store the BIOS data and for supplying the internal clock a battery on the board. (Newer boards have for a replaceable lithium battery that holds easily 10 years. With a battery life which is rather limited and when the PC is turned on after a long break, is the first sign of a "dying" battery the clock increasingly wrong. In extreme cases, the computer does not know that he ever has a hard drive and lose other BIOS settings. You can leave all my car function redetermine, but the next turn is all gone. It is better to replace the battery in time is. For this you have the board (and, unfortunately, almost everything else) to remove it from the housing and then turn the old battery and solder the new battery. Note: previously necessarily write the polarity or optionally take a picture. Substituting the battery the wrong way round, can have serious consequences. (Explosion of the battery or at least serious damage on the board) On the other hand can be caused by static electricity even when soldering damage to the board. You have to yourself and ground the Lötkoben. Therefore, the only experienced people should do !!! Now I have bought this battery to breathe "third" life my old 486 PC, which I need for my father, a. Originally a NiCd battery there was indeed there, now it is a NiMH battery. But I see this as a problem. I have already exchanged with all electrical devices NiCd batteries to NiMH batteries.
