How do you know when it's time to replace the battery in GLC300

stargazer said:

I have a 3 year old GLC300. How do I know when it's time to replace the battery? Do I just continue to use the SUV as normal until the battery died? At that point, do I just jump the battery and schedule an appointment to have it replaced at the dealership or can I replace the battery myself? I was able to replace the batteries on my other cars. On the GLC, everything is covered so I'm not sure if I should even attempt to replace the battery myself when the time comes.

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No, you won't know. Even dumb of Mercedes, the hazard lights will go on to indicate this (I was told by the mechanic). So my car ran out of battery without any warning. In UK Halfords do a great service, they fit battery at home. No need to tow the car to Garage.
I have a 2017 GLC and its giving me all sorts of problems. Failed MOT because windscreen wash doesn't spit water out and Garage says Mercedes has one of the dumbest system, its hidden behind under the engine.
Worst is their 4WD. Won't buy Mercedes ever.

VValla said:

I have a 2017 GLC and its giving me all sorts of problems. Failed MOT because windscreen wash doesn't spit water out and Garage says Mercedes has one of the dumbest system, its hidden behind under the engine.
Worst is their 4WD. Won't buy Mercedes ever.

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On my 4-year old 2018 the start/stop engine feature when you stop at a red light stopped functioning. Of course there are many factors for this feature to work. For me, over a period of a few months, I would have to take longer and longer trips for the feature to work. Then I drove 200 miles and the feature never engaged. After I put a new battery in it worked like it did when new.

if you put a new battery in be sure you (or your shop) register it with the ecu!

Ed56 said:

On my 4-year old 2018 the start/stop engine feature when you stop at a red light stopped functioning. Of course there are many factors for this feature to work. For me, over a period of a few months, I would have to take longer and longer trips for the feature to work. Then I drove 200 miles and the feature never engaged. After I put a new battery in it worked like it did when new.

if you put a new battery in be sure you (or your shop) register it with the ecu!

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Thanks for the tip. What’s the ecu?

The ecu is the computer (electronic control unit) that controls the car. Whoever puts the battery in should reset the counter. If you don’t reset the counter the car will not charge your new battery properly thus shorting the battery life. I posted a YouTube video on how I performed this function: