Easy Peasy! take off the side panel on the left as you look from the front. Look for the battery towards the front of the motherboard usually.It looks like a coin slightly smaller than a 10p piece.Using a small screw driver or the blade of a small knife press the retaining ring or catch that holds the battery in place. It will then pop out. Place the new battery in the postion and gently push it down .Replace the side panel, start up the pc but you will need to reset the contents of CMOS now. Need help? contact me on www.motherboardsrus.net
there is a phone number on there.
chris, October 2009