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  #25  
Old 09-26-2015, 06:50 PM
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Re: key fob battery

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  #26  
Old 09-28-2015, 10:45 AM
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Re: key fob battery

Not sure why they don't do like BMW and have the battery recharge wirelessly via induction while driving. That way, no battery to change except in specific circumstances (one driver, always using the same key, and their spare key that never gets used loses its charge over time).

E38 7-Series have had this tech since 1995. That's twenty years ago!
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  #27  
Old 09-28-2015, 02:17 PM
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I think the idea jeep is going after is that you never have to take the key fob from your pocket if you don't want to. Touching the handle pops the locks, key is sensed in pocket to start car and touch the inside locks or button on exterior handle to lock it. Not saying it's right or wrong but that is what they are trying to achieve with current setup
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  #28  
Old 10-18-2016, 10:11 AM
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Re: key fob battery

I had the low bat message yesterday and things that normaly worked fine stopped. For example the lock button stopped doing its thing.

I replaced the battery and now itís working great. Even the rear door which I had to be 5 feet from to get the remote to open it is now operating from 100 feet.

So I was curious about the voltage on the old one and it was 2.98. The new one is 3. I guess itís like a car battery. You can have 12 volts but little or no amps to turn it over. The fob must have the same issue. Volts but no amps??

I'm way over thinking this
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  #29  
Old 10-18-2016, 10:28 AM
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Re: key fob battery

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Originally Posted by Gravity View Post
I had the low bat message yesterday
There's a low battery message? I'm assuming it comes up on the dash. I've replaced my key fob battery twice over the past 3 years (it was low) but never saw any message.
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  #30  
Old 10-18-2016, 12:24 PM
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Re: key fob battery

I was flipping through the EVIC screens to see the tire pressure readings and saw the low fob battery warning. As someone else mentioned, I had noticed that the button to open the rear door didn't work unless I was within about 10 feet and I don't think the doors always locked.

I may replace the other fob battery soon just because my wife drives more often than I do now and she's more likely to use the remote start than I ever was.
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  #31  
Old 10-18-2016, 04:40 PM
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Re: key fob battery

Quote:
Originally Posted by Gravity View Post
I had the low bat message yesterday and things that normaly worked fine stopped. For example the lock button stopped doing its thing.

I replaced the battery and now itís working great. Even the rear door which I had to be 5 feet from to get the remote to open it is now operating from 100 feet.

So I was curious about the voltage on the old one and it was 2.98. The new one is 3. I guess itís like a car battery. You can have 12 volts but little or no amps to turn it over. The fob must have the same issue. Volts but no amps??

I'm way over thinking this
Yes, you are.

Mine lasted about 3 years 2 months.
Replaced with a Panasonic, after carefully cleaning the new battery and the innards of the fob with electronic cleaner.

... then stuffed it back in the same dirty old pocket.
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  #32  
Old 10-20-2016, 03:24 PM
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Re: key fob battery

Quote:
Originally Posted by Gravity View Post
I had the low bat message yesterday and things that normaly worked fine stopped. For example the lock button stopped doing its thing.

I replaced the battery and now itís working great. Even the rear door which I had to be 5 feet from to get the remote to open it is now operating from 100 feet.

So I was curious about the voltage on the old one and it was 2.98. The new one is 3. I guess itís like a car battery. You can have 12 volts but little or no amps to turn it over. The fob must have the same issue. Volts but no amps??

I'm way over thinking this

E=I/R ohms law Volts is the speed the electrons move. Amps is the amount of electrons. R is the load or resistance.
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  #33  
Old 10-20-2016, 04:17 PM
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Re: key fob battery

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Originally Posted by peckmv View Post
E=I/R ohms law Volts is the speed the electrons move. Amps is the amount of electrons. R is the load or resistance.
Just to correct this info: E=R*I or V=R*I. Also, if you measure a battery that's just sitting on a table with no load, a voltmeter will read, for example, close to 3.1 Volts. But if you draw current by adding a load (the key fob circuit for example) and the battery has no charge left, the voltage will drop to almost zero.

Hope this clarifies it a bit..
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  #34  
Old 10-20-2016, 11:52 PM
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Re: key fob battery

These FOB batteries are very finicky. I have replace mine twice in 3 years. The no-load voltage was above 3V but I started getting failure indications. Intermittent events were one door would not unlock and the other was OK. Sometimes I could just clean the contacts and it would be good for another few weeks. On the second battery replacement, it was still not quite 100%. I saw a TSB and thought it may be related so I went back to the dealer.
http://www.wk2jeeps.com/tsb/tsb_wk2_0810015.pdf
They said they just replaced the FOB battery. Perhaps my replacement was a dud.
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  #35  
Old 10-21-2016, 03:21 PM
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Re: key fob battery

Quote:
Originally Posted by Pinch View Post
Just to correct this info: E=R*I or V=R*I. Also, if you measure a battery that's just sitting on a table with no load, a voltmeter will read, for example, close to 3.1 Volts. But if you draw current by adding a load (the key fob circuit for example) and the battery has no charge left, the voltage will drop to almost zero.

Hope this clarifies it a bit..
Yeah the low bat warning comes up on the screen. Only stays there for 3 or 4 seconds.

And it wouldn't take much of a load to pull it down to zero or close to it. If the battery was almost done.

Someone else mentioned that BMW or Mercedes charges the fob battery while it's in the vehicle. Now that's cool.
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  #36  
Old 10-26-2016, 08:15 PM
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Re: key fob battery

Quote:
Originally Posted by Gravity View Post
Yeah the low bat warning comes up on the screen. Only stays there for 3 or 4 seconds.

And it wouldn't take much of a load to pull it down to zero or close to it. If the battery was almost done.

Someone else mentioned that BMW or Mercedes charges the fob battery while it's in the vehicle. Now that's cool.
BMW's did do that, maybe still do, but only if the vehicle didn't have keyless start. No doubt Mercedes is the same way.
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