ed57

whether it is 3 month or 9 months its still a design fault. My 200 series landcruiser FOB batteries have never been changed in 7 years. Still has the originals. And yes i can operate the door locks from similar distances to my C250.
I know you can hit the lock button twice to put it to sleep if its really annoying. I just pop in new batteries every 3 to 4 months. MB installed batteries last same interval.

GL-

The keyless start on my Hyundai Azera went 3 years before I had to change the battery.

Mike450

11 months and just got the message this morning.

yk0786

I got 19 months out of the original battery before I had to replace.

JHouse

The 2032 is also a 3V and though a little thicker, it fits and works fine, and should last longer. They make at least several 3 volt disk batteries that are the same diameter but different thicknesses. 2015/2025/2032. I read somewhere that the last two numbers are the measurement for thickness. 1.5/2.5/3.2 mm.

fabbrisd1

Yes last 2 digits are mm thickness - use CR2025 Maxell in hologram package $2.70 for 5 on Amazon - 2032 will "jam" in there - but frankly not the correct fit - depresses/ruins the rubber gaskey on the pop-off plastic lid - and causes extra pressure on a printer circuit board.

I apologize - Mercedes service advisors/salesmen/techs are simply not aware.

Mercedes has long/long relationship with Panasonic on button fob batteries - but 6 yrs ago Panasonic closed Japan factory - reopned a contract factory in Indonesia - and that's when this fob battery stuff started getting wacky with premature battery failure.

The Mercedes security system - as transmitted by the fob - is more "intensive" rf code burstwould be the best way to put it - as compared to a Hyundai as one poster referenced.

It's easy to get me worked up on this - you wouldn't believe the the blank expressions I get on corporate side.

The only thing I have been able to accomplish - the "new gen" fob's for new models starting with 17 E will be moving up to CR2032 - and security "burst" has been condensed - full code - but shrter burst - but I still can't get corp to budge off Panasonic/Indonesia -

Keep the beat !

dodopig

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

This is what i got, worked fine. $8 a pair.

Ntuck

I have owned my MB for 3 years and had to replace the battery every year. So have gone through 3.

yk0786

I am on my 3rd battery since I got the car back in May 2014. First replacement 19 months out and then my second replacement at 31 months out.

AlexMIB

I just bought the GL350 and a week later the key started acting weird, so i replaced the battery. The only one I had right away was 2032, yes its a tight fit. Reading all of these above posts I think Im gonna replace it to 2025, I think the battery I got is old, because most times it is not reacting to "lock" signal right away. I could lock my old toyota from 65+ ft away, but here i gotta be really close.

Can you guys lock your car from far away? Or is it a "feature" so that nobody could read your signal and hack it?

yk0786

I am able to lock/unlock my door from far away. I dont know exactly what the distance is, but I don't need to be right near the door/car.

AlexMIB

do you know what's your battery brand? Where did you buy it?

fabbrisd1

Use think Amazon link - buy 3yrs supply for under $4 "correct" Japan Maxell in holo package:

https://www.amazon.com/Maxell-Lithiu...s=mxell+cr2025

Pit-Pony

Extend battery life.

If you hold the lock and unlock buttons on the FOB for several seconds, you will see the FOB light flash a few times. This puts the key to sleep mode and won't drain the battery just sitting there.

Do this to your second key and the first key if the car won't be used for a while.

GL-

My Keyless-Go is psycho. I have never received a low fob battery message, but at times, it won't detect the key. I can lock/unlock the doors with the fob, but it's not detected. I've gotten so frustrated that I've removed the damn button and shoved the key in to get where I need to be. I purchased some new batteries and will give that a try, but I'm not holding my breath. This isn't something new to the vehicle. The door lock/unlock on the handle doesn't like me either. I think the '16 GL450 just doesn't like me.

jlim

About this, in my first month of so of ownership, it was frustrating as well as I was struggling with just unlocking the door from the handle. I then realized when that happened, it was because I kinda wrapped my fingers and palm around the handle which was simultaneously indicating I was trying to unlock and lock at the same time. So now I just slip my fingers behind the handle and pull it. No more issues.