Thanks for the reply EOMtp you were right. The power supply purchased from eb**Y was listed as the right supply for the x61s. It came with an adapter. But after I posted this question I tried again on the third or forth power up it will start only to be confronted with the need for a password. Pushi...

I was given an x61s without battery or power supply, history unknown w/ centrino pro, xp pro, build date 08/01. I purchased an IBM 16v 4.5a power supply and the machine starts but gives message "190: critical low battery error" then suts down does this mean it will not operate without battery instal...