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You might also check the 12v battery, if it's limping along on the original or a dead one it would have to be constantly recharged by the HV battery & inverter running more often. Our 2013 had the original battery still in it when we bought it a couple months ago, clinging on at 11.9v. Mileage seems to have improved slightly with a fresh one.
Currently have a MB EQS that’s fantastic for about 1/3 of what it cost new.
I have a 2016 Gen 4 that my partner commutes about 100 miles round trip in. Aside from its strange looks it's a great car. Zero repairs so far at more than 220K miles. No rattles or clunks. Every single electric button and switch still works.
I have a 2020 GLB250 and mine was saying "12V battery" on and off for a few weeks. I checked under the hood with a multimeter and my main battery did have a low voltage while the car was off. I replaced it a few weeks back. No more notification.
I had the same issue on my w213 - same warning every now and then until one day it just didn’t start. Replaced the battery and solved the issue.
My 2012 recently needed a battery replacement
So on top of cold weather, your battery may need attention
m.b. buy a Benz battery?
My factory battery died at 30k miles on a 2024 corolla…
In the 166 body MB ML/GL, its under the passenger seat, with barely enough room to reach the rear terminal. It's also so far forward that you can barely grab the fuckin thing. Oh, did I mention that it is a group 49 battery.
I don’t have an AMG, but a 2024 CLA 200d and having battery drain problem is annoying to say the least and haven’t even had the car for a month when it all started happening. It’s been at the dealer for the past 3 days and no voltage drop there. They gave me the signal blocking key case and they upgraded the software and still can’t find the problem. Third visit in the month and new battery installed too.
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In March 2026 on PartReview, battery OEM Toyota were overall better than OEM Mercedes.
In March 2026 on PartReview, battery OEM Toyota were overall more popular than OEM Mercedes.
By vote balance, battery OEM Toyota surpassed OEM Mercedes:
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In March 2026, according to PartReview, battery OEM Toyota led more car-specific ratings than OEM Mercedes:
OEM Toyota are chosen by owners of cars such as: Toyota Prius, and others.
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Also available: comparisons of battery OEM Mercedes with: OPTIMA, Varta, Bosch, OEM Subaru, OEM Volkswagen, YUASA, Tesla, Duralast, Exide, OEM BMW.
You can also see who is better among other battery manufacturers: OPTIMA or Varta, OPTIMA or Bosch, OPTIMA or OEM Subaru, OPTIMA or OEM Volkswagen, OPTIMA or YUASA.