Low battery - Key Fob
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
Low battery - Key Fob
Does anyone know the battery # or type I need to replace? Also I don't see a screw or latch to open it when I change it. I tried searching but I end up in other portions of forum without a clear answer. This is for a 2010 E550 with Keyless Go.
Thx
Thx
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Page 317 in the manual. Got one of those? LOL
CR2025 Lithium battery. Pull the steel key out and stab the inside of the key adjacent to the slot the steel key fits into. The top will pop open and expose the battery. Replace it and snap the cover back on.
CR2025 Lithium battery. Pull the steel key out and stab the inside of the key adjacent to the slot the steel key fits into. The top will pop open and expose the battery. Replace it and snap the cover back on.
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
Lol. Yes I do but it's stored on my work computer and I'm off today. I don't have a physical copy. Thx for the help I figured I'd get help here and avoid logging into the VPN.
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
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2006 E320 CDI 2014 C63 507 Coupe 2012 E550 4M 2016 E63s Wagon
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From: Zion
W212 E550 4M P2
Consider putting an extra battery in your glove box for "next time."
Buying batts online through Amazon or flebay can be considerably less expensive than local brick and mortar stores, but rumor has it there are lots of old and no-name batts online. The cheapies have always worked fine for me. YMMV.
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
Mercedes Benz Key Battery Change Replacement - YouTube
Consider putting an extra battery in your glove box for "next time."
Buying batts online through Amazon or flebay can be considerably less expensive than local brick and mortar stores, but rumor has it there are lots of old and no-name batts online. The cheapies have always worked fine for me. YMMV.
Consider putting an extra battery in your glove box for "next time."
Buying batts online through Amazon or flebay can be considerably less expensive than local brick and mortar stores, but rumor has it there are lots of old and no-name batts online. The cheapies have always worked fine for me. YMMV.
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
One thing that did come up when I searched the forum, was the life span of these batteries. Most people seem to say they last in the 6 months to a year range. There were some theories about placement of the FOB at night nearby the vehicle. Their theory was that the FOB constantly communicates with the vehicle if it is in a certain proximity to it.
I didn't see factual proof but many seem to believe that putting it far away at night would extend the batteries life.
I didn't see factual proof but many seem to believe that putting it far away at night would extend the batteries life.
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From: Louisville, Kentucky
Formerly: 2007 e63; 2012 GL450
My SA said that the keyfob is often emitting a signal, looking for the car (or something like that) which was interesting to me, and explains why it doesnt last as long as some of my other keyfob batteries have in the past. But at $9 for four, I aint complainin'.
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
Ah....Home Depot has the better deal I see. I'll be going there next time. My town is still dealing with tons of issues from the blizzard. Schools are still closed today in my town. So Walgreens was just to close to not take a shot at first. I have to go out of town for a Home Depot it's not to far though.
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From: Central Coast, CA
2020 X7 xDrive40i, 2016 X3 sDrive28i
One thing that did come up when I searched the forum, was the life span of these batteries. Most people seem to say they last in the 6 months to a year range. There were some theories about placement of the FOB at night nearby the vehicle. Their theory was that the FOB constantly communicates with the vehicle if it is in a certain proximity to it.
I didn't see factual proof but many seem to believe that putting it far away at night would extend the batteries life.
I didn't see factual proof but many seem to believe that putting it far away at night would extend the batteries life.
In my own experiment, I've got my 2nd pair of keys in a safe on the opposite end of the house from the garage. where as my primary key is about 10 ft away from the car by the entrance to the garage)
After nearly 3 years, the spare key battery is still good, while I've been through over a dozen batteries in the primary key.
I've found that CR2025 lasts on average 3 months in my situation, while a CR2032 lasts 6 to 9 months. The CR2032 is just a tad thicker but fits just fine.
I've tried CR2025 from various brands bought from different places (radio shack, walgreens, cvs, home depot, amazon, ebay) and they all last only around 3 months regardless of the brand, cost or where they were purchased.
I've got a ton of CR2032's sitting around (from using them in computers and various other remotes) so I've just decided to use them in my keyfob as well.
I do have keyless go on the car.
I've had other MB's without the keyless go feature that is still on original battery after 7 years.
CR2025 has 150mah while CR2032 has 250mah so it has much more energy.
Wife's BMW with keyless go equivalent uses a CR2450 which has nearly 650mah and lasts so much longer than MB.
I don't know why MB can't design their key to take a larger battery.
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
In my own experiment, I've got my 2nd pair of keys in a safe on the opposite end of the house from the garage. where as my primary key is about 10 ft away from the car by the entrance to the garage)
After nearly 3 years, the spare key battery is still good, while I've been through over a dozen batteries in the primary key.
I've found that CR2025 lasts on average 3 months in my situation, while a CR2032 lasts 6 to 9 months. The CR2032 is just a tad thicker but fits just fine.
I've tried CR2025 from various brands bought from different places (radio shack, walgreens, cvs, home depot, amazon, ebay) and they all last only around 3 months regardless of the brand, cost or where they were purchased.
I've got a ton of CR2032's sitting around (from using them in computers and various other remotes) so I've just decided to use them in my keyfob as well.
I do have keyless go on the car.
I've had other MB's without the keyless go feature that is still on original battery after 7 years.
CR2025 has 150mah while CR2032 has 250mah so it has much more energy.
Wife's BMW with keyless go equivalent uses a CR2450 which has nearly 650mah and lasts so much longer than MB.
I don't know why MB can't design their key to take a larger battery.
After nearly 3 years, the spare key battery is still good, while I've been through over a dozen batteries in the primary key.
I've found that CR2025 lasts on average 3 months in my situation, while a CR2032 lasts 6 to 9 months. The CR2032 is just a tad thicker but fits just fine.
I've tried CR2025 from various brands bought from different places (radio shack, walgreens, cvs, home depot, amazon, ebay) and they all last only around 3 months regardless of the brand, cost or where they were purchased.
I've got a ton of CR2032's sitting around (from using them in computers and various other remotes) so I've just decided to use them in my keyfob as well.
I do have keyless go on the car.
I've had other MB's without the keyless go feature that is still on original battery after 7 years.
CR2025 has 150mah while CR2032 has 250mah so it has much more energy.
Wife's BMW with keyless go equivalent uses a CR2450 which has nearly 650mah and lasts so much longer than MB.
I don't know why MB can't design their key to take a larger battery.
Great info
This seems to be the consensus that a FOB staying adjacent to the car will die much quicker. I'm still trying to add some tags but can't seem to find the place to after starting the post. This will be handy for the next person who needs this info.
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From: Chicago (Palos Park)
2023 CLA 250, 2021 GLC43, 2003 CLK320
One thing that did come up when I searched the forum, was the life span of these batteries. Most people seem to say they last in the 6 months to a year range. There were some theories about placement of the FOB at night nearby the vehicle. Their theory was that the FOB constantly communicates with the vehicle if it is in a certain proximity to it.
I didn't see factual proof but many seem to believe that putting it far away at night would extend the batteries life.
I didn't see factual proof but many seem to believe that putting it far away at night would extend the batteries life.
One peculiar issue I just ran in to with both of my wife's keys for the w212 was that they both ran out at the same time even as one of the keys is in the house not used. I checked the voltage and both showed 3v which should have been fine yet the car kept reporting low battery.
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From: New Jersey
2010 E550 P2 w/AMG Sport Package + Pano, 2015 Nissan Pathfinder
This is interesting, I like to keep my car keys in the car even when on the driveway. Just no worry about looking for the key, its always there in the car
One peculiar issue I just ran in to with both of my wife's keys for the w212 was that they both ran out at the same time even as one of the keys is in the house not used. I checked the voltage and both showed 3v which should have been fine yet the car kept reporting low battery.
One peculiar issue I just ran in to with both of my wife's keys for the w212 was that they both ran out at the same time even as one of the keys is in the house not used. I checked the voltage and both showed 3v which should have been fine yet the car kept reporting low battery.
That is interesting was the secondary key still fairly close to the car meaning on the 1st floor or whatever?
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A good test would be to put the keys where you normal do and go outside and try to open your car door.
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From: Central Oregon
2019 E450 4Matic Cabriolet, Dune Silver Metallic / Black Leather
If you park your car on the street, you might consider keeping your key in some kind of Faraday cage. Bad guys can buy a box that acts as a "repeater" for your key, faking your car into thinking that you are standing in close proximity with the key and allowing the bad guy to unlock your car. Completely unbeknown to you.
http://www.wired.com/2015/08/hackers...opens-garages/
http://www.wired.com/2015/08/hackers...opens-garages/
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If you park your car on the street, you might consider keeping your key in some kind of Faraday cage. Bad guys can buy a box that acts as a "repeater" for your key, faking your car into thinking that you are standing in close proximity with the key and allowing the bad guy to unlock your car. Completely unbeknown to you.
http://www.wired.com/2015/08/hackers...opens-garages/
http://www.wired.com/2015/08/hackers...opens-garages/
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From: Central Oregon
2019 E450 4Matic Cabriolet, Dune Silver Metallic / Black Leather
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The spare key is inside the house maybe 20 feet away from the car which is in the attached garage. Two walls between. My wife keeps her key in a bag that is about 10 feet away behind a wall. If I open the car while her bag is in the house the car does not to appear to detect the key. I really did not time how long the battery lasts but it is not long at all. Will need to note the day I changed it in my car log spreadsheet. What really bothers me is that the car reported low key battery while the voltmeter showed it at 3v. The new one read as 3.25v. These are all Energizer CR2025 as I got a couple dozen on Amazon. Once these are out I will just use the CR2032 but the dozen or so I still have left even at 3 months will still last a while. Just a hassle to keep changing.
As you pointed out its a bad choice by Mercedes. They should have used CR2450 with 650mah. Using the low capacity CR2025 is just silly. Maybe they wanted to save the weight or perhaps ramp up business for the dealers. Wonder how much they would charge to change the battery
)))
