Odd Battery Question & Part Identification Request

[FALKLAN]

Howdy everyone! I hope all is well!


I was changing a key fob case and something happened after I installed the circuit board/transponder and completed the transfer. While the two CR2025 batteries (Energizer) where sitting on my mousepad, my precision screwdriver stuck to the magnet on the end of my flash light lying nearby. I thought nothing of it and removed it and tossed it on the desk. Well, needless to say or not, the screwdriver touched both negative sides of the two batteries sitting there. I really didn't think about it, but it did something to the batteries and the key fob no longer transmits.


I do not know if the batteries' metal outer casing is non-ferrous, but the metal casing must have become magnetized. I swear that I used a small screw to test the batteries, but it did not seem as if they were magnetized.


I purchased a brand new set of CR2025 batteries, but it did not resolve the problem. I figure it may have changed the polarity of the key fob, but I don't know. The key starts the vehicle so the transponder is functioning, because if it's not functioning the IMMO system will not allow the vehicle to start and run.


Can anyone explain how that may have caused the key fob to stop transmitting please?


Would anyone please help me identify the part in the attached image? It sets the temperature for a convection oven that is no longer manufactured, and I could probably find a replacement if I knew what its called.
Stamped Info on component: K & I k191, 250v-10a, 125v-16a.

[indeterminate]

It is a Thermostat
The particular design is quite common for stove hotplates.

[CaptDon]

There is NOTHING that screwdriver did to your batteries or keyfob. You can't change the polarity of the guts of the keyfob. You could put the batteries in upside down and ruin the keyfob. If two batteries are laying with the negative side up and you lay a screwdriver across them NOTHING will happen. There is no closed loop current path. It wouldn't even matter if the batteries were on a metallic surface and you laid the screwdriver across them as long as both negative sides were up OR both positive side up BUT NOT if opposite polarities were up and the batteries were on a metallic surface. You probably wrecked something in the keyfob OR it needs to be matched to the car again (unlikely).

[benj38]

Regarding how to find a replacement thermostat for your oven, you will not find the part by using the information printed on the part itself; instead, you have to look for replacement parts using the exact model number of the oven as the starting point, and then simply looking for a "thermostat" for it. Match the image of whatever part comes up in the search with your part, to see that they have the same shape and electrical connections. Do not expect the markings on the parts to necessarily match.

[fzabkar]

https://www.aliexpress.com/item/1005006305264055.html

https://www.google.com/search?q=bimetallic+thermostat+k191%2C+250v-10a%2C+125v-16a&udm=2&tbs=rimg%3ACZcPZ2LqO14zYVsCxfs9GZ3lsgIAwAIA2AIA4AIA&hl=en

[FALKLAN]

Thanks for the feedback!

As for the key fob, I can't even find a locksmith that can even tell me if the fob is transmitting or not. None of the near by auto parts stores have the key fob testers anymore, and the only one that does has the faulty Energizer tester that doesn't function. The closest dealership is over 100 miles from here also. Mercedes-Benz key fobs are just a PITA to deal with and expensive too boot. You would think that a 22 y/o vehicle would be relatively easy to work on, but damn Mercedes. No locksmith will even cut a key for it even though I have blank key blades and a working key as a reference. You must either go to a dealership for keys, or hit an indie shop if you can find one that deals with key fobs. I lack the equipment to pickup signals at those frequencies, because my device is for cellular frequencies.

I really didn't believe that it was actually called a thermostat. I know more about automotive and residential type thermostats.

Thank you for the URLs! 

Quote from: fzabkar on February 21, 2025, 03:15:32 pm>https://www.aliexpress.com/item/1005006305264055.html

https://www.google.com/search?q=bimetallic+thermostat+k191%2C+250v-10a%2C+125v-16a&udm=2&tbs=rimg%3ACZcPZ2LqO14zYVsCxfs9GZ3lsgIAwAIA2AIA4AIA&hl=en

[FALKLAN]

Well W.T.F........

I tried the old fob again before taking off heading to a dealership and the damn thing sync'd just fine.