If you see the POST error in the picture on your IBM Thinkpad 600X's screen, your BIOS battery is probably dead. BIOS batteries for Thinkpad 600Xs go for $40.00 online. However, the actual battery is simply a common lithium watch battery with a special (expensive) connector. I will show you how to carefully remove the connector from your dead battery and attach it a new watch battery purchased for $5.00 at Radioshack.

Parts and tools:

1x dead Thinkpad BIOS battery
1x CR2025 watch battery
1x Roll of packing tape
1x Sharp knife
1x Needle-nose pliers

Step 1: Get a New Battery and Remove the Old One.

Get a CR2025 lithium watch battery from RadioShack.

Remove the dead BIOS battery from the laptop. It lives in a little holder next to the RAM on the bottom of the Thinkpad.
Wow -- I've been wondering how to fix my IBM...<br><br>Great instructable!
A few years ago I had a 600x which gave a BIOS error on startup which turned out to be 'fan not running'. Rather than invest in a new fan and all the fitting problems, the workaround I found was to blow hard into the ventilation grille when the thing was starting up. Looked a bit strange but it worked!
&nbsp;That's so cool. I imagine it's like a vestige of winding the prop of a plane before starting the engine, but in an electronics age&nbsp;miniature&nbsp;representation.<br /> <br /> Of course the reasons for both are different, but, it still brings forth imagery.<br /> <br />

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