Battery Tender
MBWorld Fanatic!
Joined: Mar 2006
Posts: 4,278
Likes: 379
From: San Jose area
'19 E63S sedan
MBWorld Fanatic!
Joined: Feb 2014
Posts: 6,190
Likes: 1,550
From: MA
2008 E350 4Matic, 2011 E350 4matic
They were also in the W211. Mine is original in that car, it's 12 years old at this point. I don't think they last as long in the W212 because MB doesn't seem to charge them up as much as they did in the past. Not fully charging a battery is what will kill it prematurely.
MBWorld Fanatic!
Joined: Nov 2014
Posts: 5,397
Likes: 1,108
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They were also in the W211. Mine is original in that car, it's 12 years old at this point. I don't think they last as long in the W212 because MB doesn't seem to charge them up as much as they did in the past. Not fully charging a battery is what will kill it prematurely.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 4,278
Likes: 379
From: San Jose area
'19 E63S sedan
They were also in the W211. Mine is original in that car, it's 12 years old at this point. I don't think they last as long in the W212 because MB doesn't seem to charge them up as much as they did in the past. Not fully charging a battery is what will kill it prematurely.
It was the adoption of auto start that triggered the wholesale switch to AGM.
I agree that the charging system in the 213 doesn't do a complete job. After an hour on the highway, I can connect the CTEK and the battery will continue to accept charge for 24 hours. All I can think is that the supercap auxiliary "battery" needs to be coddled so the alternator output is throttled. I know that these secondary battery replacement devices are a major reliability problem.
