Kenneth wrote: <<Typically there is a watch-type battery that's easy to spot and hopefully just as easy to pop out of its clip and replace once you switch the computer off.>> I'd just add to Kenneth's excellent notes: Before you flip the old battery out, make a note of which side is facing up. One side is marked + and the other - . The new battery must go in the same way round in order to preserve the correct polarity. I'm not sure what would happen if you put it in the wrong way round. Perhaps time would be reversed, so that you could travel backwards in time to some bygone era. Don Penlington PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml