Key fob battery warning won't go away

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01-10-2023, 11:12 AM

#41

synergize

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Quote:

Originally Posted by Nikon1

Unfortunately, I changed out a set of 6 month old 2032 batteries from my Audi fobs a week or 2 ago. Next time I run into a problem, I’ll test the suspected weak cells and report back on the findings.

— John

John:

A cool feature of the unit is that it has a self test of the 4 internal AA batteries. When testing a battery if the first two LED's blink alternatively, the (10% and 20%) it's time to replace the unit's batteries. i thought this was a clever addition to the unit.

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Nikon1 (01-11-2023)

02-16-2024, 06:14 AM

#42

209Rainbows

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This worked for me

Quote:

Originally Posted by SloopJohnB@mac.com

Press and hold down the "unlock" button on the remote. While holding the "unlock" button, insert the key into the ignition. Hold the "unlock" button and turn the key to the ON position for two seconds. Turn the key to the OFF position, remove it from the ignition, release the "unlock button"

This actually worked for me! Thanks for sharing.

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02-16-2024, 06:32 AM

#43

Nikon1

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Quote:

Originally Posted by Tesla1856

Would be interesting to hear if the old/worn CR2032 batteries (that still measure around 2.8v with just a conventional meter) fail under load with this tester (like they do in a Audi key-fob).

UPDATE: I changed the batteries in both of my Audi fobs in January of 2023. About a week ago I thought I would test them 13 months later. In those 13 months I have had zero issues with unlocking / starting my S5.

To my surprise, when I checked them 2 weeks ago on the MBT-1 load tester, they both showed the maximum number of LEDs illuminated (6). I’ll try to remember to test them in June — which would be 18 months since they were installed.

—John