How long does fob battery last?
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2019 E300
How long does fob battery last?
My fob battery is only 9 months old and I got a replace fob battery message when I try to start the car yesterday. Almost all my other car's fob battery will last more than 1 year, some as long as 2 years. How often do you guys replace your fob battery?
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2019 Mercedes-Benz GLS
Mine also lasts about 9 months. Wife's Nissan remote's battery has never been replaced - 6 years old and the range is still the same.
I keep spare batteries in the house and in the car. Since I only use one key fob, I should probably check the other one's battery..
Edit: I have Keyless Go
I keep spare batteries in the house and in the car. Since I only use one key fob, I should probably check the other one's battery..
Edit: I have Keyless Go
Last edited by JSch; Aug 17, 2016 at 11:55 AM. Reason: Add Keyless Go
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2019 E300
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From: Central Coast, CA
2020 X7 xDrive40i, 2016 X3 sDrive28i
With keyless go E350, 3-6 months on average with the CR2025, with a slightly thicker CR2032 it lasts about a year.
Without keyless go C300, battery at 5+ years and still working fine
Without keyless go C300, battery at 5+ years and still working fine
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From: Northwest Illinois
2014 E350 also restored: 1969 Camaro convertible SS 1957 Chevy Belair 2dr hardtop
The first time I had oil change the dealer replaced the battery on remotes. They lasted about 2 weeks Went back and told them to use new batteries this time. Knock on wood I now go in once a year for oil change and I have them replace the batteries. No problems since I told them to use new batteries.
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From: Barrington IL
2015 E 250, 1999 BMW M Roadster, 1939 International Harvester, 2023 GLC
I read somewhere there is a TSB on the "replace key battery" warning. A software issue.
My 05 W211 never had battery replaced. They should last a few years I'd think.
My 05 W211 never had battery replaced. They should last a few years I'd think.
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From: Northwest Illinois
2014 E350 also restored: 1969 Camaro convertible SS 1957 Chevy Belair 2dr hardtop
My dealer says it should be replaced once a year, I can live with that. The wifes cadillac has the original battery in remote and it is 16 years old. But then again that is an american car. Just the engines and transmission go out and you have to replace them.
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2019 E300
My old BMW had keyless start as well and I park and leave my keys at the same spot in my house, the BMW fob battery lasted over 2 years before it needed replacement.
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2019 E300
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From: Southeastern USA
2010 E350 Luxury Sedan, Engine 272 (V6)
Replaced it in fob I ordinarily use at four years because cheap to do. Ironically, the fob I almost never use has 7 year old battery that still works fine. Do not have keyless go.
My Nissan Rogue SUV has "keyless go" and battery only lasted 18 months.
My Nissan Rogue SUV has "keyless go" and battery only lasted 18 months.
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From: NH
2012 E550 (W212)
I'm not sure how long mine lasted, since I picked up a 2012 CPO nearly a year ago. One fob runs strong, the other's battery died on the morning commute a few months ago. There wasn't much notice, and I now keep a spare battery in the center console just in case.
-Adam
-Adam
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From: West Central Florida
2011 E550 P2 4M Sedan
Had my W212 for 2 years and already done 3 replacements (although one was by dealer when there was no warning).
I had a Toyota with keyless (smart key) for 8 years and never needed to replace battery.
MB is just better at everything.
I had a Toyota with keyless (smart key) for 8 years and never needed to replace battery.
MB is just better at everything.
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From: Texas
E350-2014 Sport ,Honda 2001 Accord, FireBird-1992-Formula
I was getting 3-6 months on key fob batteries with KEYLESS-GO. Dealer said keep key fobs away from each other. If kept close to each other they talk to each other and run down.
(Forgot when this was.)
(Forgot when this was.)
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From: Minneapolis, MN/Breckenridge, CO
2010 E550 4Matic Sport P2
Replace them more often.... I learned the hard way when I left my key in the car and it locked but would not open.... had to call roadside. Not a fond memory. Resulted in a "how to break into my own car" thread here last summer....
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From: Central Coast, CA
2020 X7 xDrive40i, 2016 X3 sDrive28i
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2019 E300
Thanks, good to know, I will order some 2032. On paper, the CR2032 has 47% more capacity than the CR2025, 163 mAh vs 240 mAh.
Last edited by The G Man; Aug 19, 2016 at 09:49 AM.
