A computer search for "Dell Dimension 8400 battery replacement" should turn up all the information you need. You might want to start at http://support.dell.com/support/edocs/systems/dim8400/sm/parts.htm#wp1058524 http://support.dell.com/support/edocs/systems/dim8400/sm/techov.htm#wp1052739 Bruce --- On Sun, 5/15/11, Donald DeWitt <[log in to unmask]> wrote: From: Donald DeWitt <[log in to unmask]> Subject: [PCBUILD] Battery Warning To: [log in to unmask] Date: Sunday, May 15, 2011, 3:37 PM I’m running a Dell Dimension 8400 sp2 During boot-up there is a system battery low voltage warning. I assume that means the battery is ready to be replaced. What are the basic dos and don’ts on replacing it? Where is it located and where do you buy one? Do I lose any settings when replacing it? This is the first time I have run into this. There are no other problems with the computer; it is in good running condition. Thank you, Don DeWitt The NOSPIN Group has added a new feature on our website, web based bulletinboard for questions and answers: Visit our sister website at http://nospin.com PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml