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I recently got my main battery replaced at the authorized Mercedes service centre and they charged me about $365 including labour. The new battery came with 2-year unlimited kms warranty. Interestingly, when I asked about the AUX battery, they said my car (220, 2017) did not have one. Daimler is using Voltage dip fuse instead for Eco Start/Stop function. More can be found in this article > "Ignition current limiter replaces the backup battery concept"
 

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Yeap, that is correct. Im no longer on warranty.
In more recent threads it has been suggested to replace both batteries. How is your AUX holding up?
 

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Discussion Starter · #23 ·
In more recent threads it has been suggested to replace both batteries. How is your AUX holding up?
i’ve never replaced my aux battery yet. It has been 6 years since i own this car. The main battery was replaced last year and in 2017 when this thread started.
 
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