Keyless GO Fob Battery Life? - Page 2 - Mercedes-Benz Forum
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post #11 of 18 (permalink) Old 10-27-2018, 08:05 PM
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I have my key fobs both with the same batteries, 2025 Panasonic, for 2 years. I can still start my 2011 GLK350 (just 50,000ml) and still no problems. As I mentioned before, I keep the fobs in a drawer of my desk in my home. The fobs are not able to talk to the car, who sits on my driveway.
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post #12 of 18 (permalink) Old 04-24-2019, 10:42 AM
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Bringing up this old thread as I too am all of a sudden having this issue where I'm constantly getting Low Battery Life for the fobs. I measured the voltage before I put them and they were at 3.2 volts.. then a month later I started oddly getting the Low Battery Life message, I rechecked the voltages in the fobs and now they are at 2.9. Not sure why 2.9 volts is not enough but I'm going to give it a try where a previous member suggested moving the stored location 10+ feet away from the car and see what happens.

Just a side question.. if the fob battery dies when we are out and about.. does that mean we can't start the engine and drive home? Kinda sounds like its intended purpose.
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post #13 of 18 (permalink) Old 04-30-2019, 04:20 PM
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Please use genuine Panasonic CR2025 - like a 5 pack is under $3 on Amazon Prime (red/black packaging)


Yes - if key battery is dead - remove Keyless Go Button - and Keyfob inserted into ignition will start the car.

If you hasve Keyless Go and leave on a trip for 2-3 weeks - pull the Leyless Go Button to "turn off the ears" listening for the Key Fob
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post #14 of 18 (permalink) Old 04-30-2019, 04:39 PM
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Thank you! That is very helpful.. here is an odd thing.. when trying to simulate a dead key fob battery, I press the lock touch door handle and/or key fob button, remove the fob battery, then with the metal key I insert and unlock the door. The glk horn/lights start flashing. I don't know if this is an MB alarm or aftermarket because we got the glk used. How would this be turned off if the key fob is dead?
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post #15 of 18 (permalink) Old 05-01-2019, 02:46 PM
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I do not know where you put your fob, when you are at home? Mine are in a drawer of a room facing the driveway. And my car, a 2011 GLK350, is on the driveway. Maybe it helps also that my windows are double pane glass. But both the Panasonic 2025 batteries in both the fobs are 2 years and 5 month old and still going strong. Somebody told me the livespan should be about 3 years. I will find out.
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post #16 of 18 (permalink) Old 05-02-2019, 08:01 AM
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My car is garaged. I leave my fob in the ashtray. Car built 3/12, is a 2013 GLK250. Both fobs still going strong, no battery problems yet.
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post #17 of 18 (permalink) Old 05-04-2019, 06:00 PM
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Quote:
Originally Posted by Bob338 View Post
My car is garaged. I leave my fob in the ashtray. Car built 3/12, is a 2013 GLK250. Both fobs still going strong, no battery problems yet.
Is the battery also a 2025 Panasonic? Somewhere on the internet I was told that the life span of those batteries is 3 years. But yours prove it can be longer. This coming December I have the batteries for 3 years. We will see.
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post #18 of 18 (permalink) Old 05-04-2019, 08:40 PM
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Quote:
Originally Posted by IndoRon View Post
Is the battery also a 2025 Panasonic? Somewhere on the internet I was told that the life span of those batteries is 3 years. But yours prove it can be longer. This coming December I have the batteries for 3 years. We will see.
I have no idea what the batteries are. I have two keys, both work, one stays in my desk most of the time, the other in the car.
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