Keyless GO Fob Battery Life?
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Newbie
Joined: Feb 2016
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2015 GLK350, 2001 E430
Keyless GO Fob Battery Life?
I have a new to me CPO 2015 GLK350. Bought it from the local dealer, it was their courtesy vehicle and it has 14K miles. About a week after we got it I started getting a warning message that my fob battery was low and to replace it which I did. I went ahead and changed the wife's battery too. Now, a month later hers is giving the same message. What are you all seeing as the average battery life in the fobs? I would think that something is wrong as I've gone years without changing keyless batteries in other vehicles...what you say?
Senior Member
Joined: Jul 2014
Posts: 422
Likes: 61
From: South East US.
2015 GLK350
The battery should last a year or more, but it is possible that you got a hold of some cheap batteries. Also be aware of where you are keeping your key. Even having it in a pocket full of change will cause the transmitter to work harder and drain the battery quicker. Keep it away from cell phones and other metallic objects that will stress the transmitter.
I recently had my key in my pocket with a bunch of change and the key became warm to the touch. My instrument cluster told me to replace the key battery. After that I looked in the manual and noted the key precautions as I reviewed the battery replacement instructions. I am now convinced that the key transmitter caused and battery discharge caused the key to warm.
I recently had my key in my pocket with a bunch of change and the key became warm to the touch. My instrument cluster told me to replace the key battery. After that I looked in the manual and noted the key precautions as I reviewed the battery replacement instructions. I am now convinced that the key transmitter caused and battery discharge caused the key to warm.
Super Member
Joined: Mar 2005
Posts: 932
Likes: 38
From: North of Boston
about a year....if replacement batteries have been sitting on the shelf for a while, not as long.
My dealership says that they will replace battery as long as I have car (amazing to believe).
My dealership says that they will replace battery as long as I have car (amazing to believe).
Member
Joined: Jun 2009
Posts: 139
Likes: 2
GLK350
it should last more than a year. don't keep it too close to the vehicle when you parked it at home will help too. My dealer changes it at every yearly service (and leave an extra for my other key fob) so it hasn't been an issue. also don't get cheap batteries 
Member
Joined: Oct 2007
Posts: 163
Likes: 53
From: Surrey B.C.
2013 GLK 350 4 matic
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A gaggle of MB's
The "issue" is with the MB FOB battery - made by Panasonic - 4/5 yrs ago Panasonic moved that battery factory from Japan (great battery) to Indonesia (not-great battery).
Easily solved - genuine Maxell CR2025 is still made in Japan - note hologram package ONLY or sadly it's a knockoff.
Aamazon - hologram pack - 5 pack for under $4.00 - 5yr shelf life:
Easily solved - genuine Maxell CR2025 is still made in Japan - note hologram package ONLY or sadly it's a knockoff.
Aamazon - hologram pack - 5 pack for under $4.00 - 5yr shelf life:
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Junior Member
Joined: Jan 2016
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GLK 350 4 Matic
Member
Joined: Aug 2015
Posts: 113
Likes: 25
From: Washington State
2013 GLK 350 4Matic
I found that dropping the fob in an rf shielded pouch, at night, when i"m home makes the batteries last longer than the 2 months I was getting. I bought 2 pouches on Amazon for $8 a piece and keep the spare key in one as well. My spare has lasted over a year by doing this and the one I use every day is going on 8 months and still going strong.
Senior Member
Joined: Apr 2006
Posts: 378
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From: Boston and SWFlorida
2025 GLC300 white, 2023 Taycan RWD black
Timely post for me.
I have had my 2015 GLK for a year. Last month I replaced both key batteries and now I am getting the change battery warning again. I'm bringing the car in for service later this month and hopefully they will change the battery for me next time. I'm not buying a key pouch just to preserve my keyless go.
I have had my 2015 GLK for a year. Last month I replaced both key batteries and now I am getting the change battery warning again. I'm bringing the car in for service later this month and hopefully they will change the battery for me next time. I'm not buying a key pouch just to preserve my keyless go.
Member
Joined: Aug 2015
Posts: 113
Likes: 25
From: Washington State
2013 GLK 350 4Matic
Timely post for me.
I have had my 2015 GLK for a year. Last month I replaced both key batteries and now I am getting the change battery warning again. I'm bringing the car in for service later this month and hopefully they will change the battery for me next time. I'm not buying a key pouch just to preserve my keyless go.
I have had my 2015 GLK for a year. Last month I replaced both key batteries and now I am getting the change battery warning again. I'm bringing the car in for service later this month and hopefully they will change the battery for me next time. I'm not buying a key pouch just to preserve my keyless go.
