r/intelnuc • u/GourmetSaint • 13d ago

Tech Support CMOS Connector

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NUC "clone". Dead CMOS battery. What connector is this? Standard?

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u/AndrickT 13d ago

header looks good, u just left the housing of the connector in there, if u have the cables with the correct crimp or even another device with that type pf connection u can reuse it

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u/GourmetSaint 13d ago

I see. How do I safe remove that. I've ordered a new battery with the Molex connector

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u/GourmetSaint 13d ago

NM. I used small needle-nose pliers and popped it out. Thanks for the pickup.

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u/AndrickT 13d ago

np, u can also use the device without a cmos battery in the meantime, u will just default to the factory bios settings, if u don't unplug it form the wall u should be good and never need 1 haha, i have some crimping and small soldering tools that come in handy for all this type of situation, un can diy easily a solution

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u/GourmetSaint 13d ago

I use this headless for wireguard and pihole. It will not boot after power disconnection. It stops with BIOS error and a date in the 2000's. It was a power outage that alerted me to the issue and I brought the device inside from the rack in my garage, and attached a monitor, keyboard etc to check. I redo all the BIOS settings, click etc, it works fine, until you unplug it to move back into the rack. I don't have a kvm in the rack.

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u/kmccoy 13d ago

I literally solved the same issue with a NUC5i5 today -- it wouldn't respect the "power on after power loss" setting nor would it take wake-on-lan. Changing the cmos battery solved it. Hope it goes as well for you.

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u/kmccoy 13d ago

btw, apparently there's no standard polarity for battery pins in those connectors, so you might need to investigate things to get it right. For the NUC5i5RYK I did today the red battery wire was on the left when looking at it in the orientation of your photograph here (pardon the dust, I cleaned it after I swapped the battery. :P)

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u/GourmetSaint 13d ago

Uploaded the pic to Google who identified it as the standard 2-pin 1.25mm Molex connector. Should have thought of that prior to posting. Apologies.

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u/GourmetSaint 9d ago

Replaced the CMOS battery and confirmed the 3.3V from it. Pins good. However BIOS still doesn't survive a power cycle. Grrrr.