Key Fob Battery

[HoosierDaddy]

If you take the fob apart like changing the batteries you can see why the batteries are oriented + to + with the "plate" between. The batteries are actually powering two different areas of the fob. Look at the connection points and you can see the routing. I had it all apart and noticed the wiring connections.

I should have just swapped the batteries then. Since I doubt any button had been pressed more than 5 or 6 times in 5 years, one battery probably has another year or two in it.

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[Elp_jc]

Using one battery instead of 2 makes a lot of sense.

I've never seen a fob have 2 batteries in my life, and I've bought literally dozens of new vehicles during my 59 years. Did the old Ford fobs have 2 batteries, since you made that comment? The great majority of them have had a single CR2032 3V battery, which is the most common. The CR2450 is also 3V, but about twice as big indeed. With that big a$$ fob, not surprised it needs that big of a battery. Ha ha.

 

[GTP]

My car started complaining about the key fob battery low. For either of both fobs.

I cracked them both open and had two new CR2045 3v batteries on hand. They read just 0.1v higher than the old batteries. I.e. 2.8v instead of 2.7v. When I put in a new battery, the dash message remained.

Not sure how to proceed.

 

[Decosse]

I've never seen a fob have 2 batteries in my life, and I've bought literally dozens of new vehicles during my 59 years. Did the old Ford fobs have 2 batteries, since you made that comment? The great majority of them have had a single CR2032 3V battery, which is the most common. The CR2450 is also 3V, but about twice as big indeed. With that big a$$ fob, not surprised it needs that big of a battery. Ha ha.

My 16 had one battery, my 19 has two.

 

[Adam the Lighting Guy]

Odd that this thread posted when it did. This past Monday morning with my 2020 EB company car, I too got the low battery key fob message. The fob requires (at least mine did) 1 - 2450 battery. Bought one across the street at Depot' for $5.49 and changed in in about 30 seconds.

 

[GTP]

I wrapped up one of my key fobs in aluminum foil and left it in the house.
I exchanged the battery in the other fob and I did not get the Low Battery warning.

So I think both fobs were in range which made me think that they both needed batteries.

Curiously when using my DVM battery test feature, the voltage dropped from 3v to only 0.6v. So maybe it is too high of load for a watch-style battery. ?

 

[nikkolaus]

Over the last few days my car has been nagging me at every start that my battery is low. I'd just had my key fob opened up probably a month or two ago because I had to swap the internals to a new case... Because Ford, in their infinite stupidity, can't make a durable key fob that bangs around in peoples' pockets everyday - and had chunks of plastic missing. Though i digress... Before installing 2 brand new lithium CR 2025 batteries into my key fob, I took a reading of the new batteries - 3.2+ volts ... It's a 3V battery, so great! Do the swap.. take the old ones out... Wonder how much was lost -- The "old" batteries that the fob was whining had to be replaced soon, or risk being locked out of my car....? Yeah.... 2.96 volts ... 2.98v on one, and 2.94v on the other... are you kidding me, Ford...? ...So all that separates a totally normal day, and an inconvenienced day, and some money shelled out, is 0.3 volts...? What a crock...

I'm thoroughly irritated now... Seems like such a small insignificant voltage difference!

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