Originally posted by Weazel
There are power inverters that you can buy on EBay, $70 for good ones if I'm not mistaken. There have been a few similar posts somewhere on this site, people there could help you out better than I.
What model laptop do you have?? Since my electrical system is kinda quirky, I wanted another battery. After some looking I got one on EBay pretty cheap, like $30. Good luck.