Catalyst 3750 CMOS battery replacement procedure

[Waterbird]

Please advise me as to the procedure for replacing a CMOS battery on a 3750.  I have searched for videos and documentation on this but have not found anything useful.  I'd also like to know the level of difficulty as I will be advising a customer on the phone on how to do it themselves.

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[balaji.bandi]

First why you think that batter issue? what kind of Logs do you see on the Logs? before you open the kit.

see the document warning :

you can find the video of what is inside :

https://www.youtube.com/watch?v=_7Oq52yDNv0

[Waterbird]

Thank you for the video and the explosion warning.  I will warn the customer that they could explode if they try this.  I didn't see where the CMOS battery is exactly in the photo.  I'm sure it's a CMOS battery problem as when the switch loses power due to a power outage, the clock resets to 1993.

[balaji.bandi]

You can set the Clock or NTP Again and write the config and test it. (before any further steps).

[Waterbird]

Yes, setting the clock again does fix the symptoms, but the root cause is the battery and the customer would like it replaced.

[balaji.bandi]

I can understand the requirement, Most Case TAC will replace the kit if that failed with RMA, this battery will charge automatically and last long.

[Georg Pauwen]

Hello,

on a side note, I think Cisco changed their TAC policy on replacing Lithium batteries a few years ago (see link below). Basically what it comes down to is that it is more expensive to ship them then to buy them yourself.

That said, I don't see the battery on the 3750 motherboard myself right away. I think it is usually similar to the round CRC2032 batteries...

https://www.cisco.com/c/en/us/products/collateral/routers/asr-9000-series-aggregation-services-routers/bulletin-c25-737963.html