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Support and repair guides for the Lenovo ThinkPad T480. Released in January 2018.

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There is a very tiny button that I have heard you press to reset.

There is a very tiny button that I have heard you press to reset the system to prepare for a new battery.

On my T480 it's a few inches away from the external battery gold contact pins. What I don't know is when do you press it and for how long.

Most videos i find are not for T480s but they all seem to say hold this button for 15-30 seconds. any idea if you do this with both batteries installed or just the internal or both batteries removed.

I can't seem to find definitive information on what to do. Once i changed my internal battery, Windows now says that the external battery is not present when i know it is installed properly.

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Tengo el mismo problema. Cambie incluso de batería pero no se soluciono.

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Hi Peter C.

I wasn't able to find definitive information on the pin hole button either but I have some other information that might help.

I know this sounds really obvious, but have you tried shutting down your computer and restarting it? Sometimes, this will resolve the situation. The second thing I found was to discharge the static from your T480. If you haven't done that, it may fix the problem. To do this, first make sure that your laptop is completely powered off. Next unplug the device from the AC adapter. You will need to remove the external battery and then remove the back case, and finally the internal battery. Once the internal battery is removed, flip the computer over and press and hold the power button down for about 1 minute. Once you've done that, you can put your batteries back in, plug the charger back in, and finally turn your computer back on to see if that fixes your problem.

If this doesn't work, you may need to check your battery drivers to see if they need to be updated. If they have been updated, you may need to uninstall and reinstall the battery drivers. If those options don't work, you may need to update the Bios. I hope this helps!

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The switch below the contacts of the external battery is for chasis intrusion detection, it detects when the computer has been opened. The switch at the side of the contacts is for detecting battery removal and trigger the use of the internal battery and prevent a power loss due the sudden removal. Remember this machine has two batteries to allow hot swapping

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Peter C será eternamente grato(a).
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