Battery Question
Thread Starter
MBWorld Fanatic!
Joined: Sep 2009
Posts: 2,601
Likes: 111
From: LA
W213 E63
Battery Question
So when I got the car, it wasn’t being driven for a while. It’s a 21 with about 9K miles. I try not to drive it, or drive it as little as possible. I have a battery tender and I’ve used it to fully charge the battery, but still if I sit in the car for 5-10 min listening to music with the car turned off, I get a 12V battery check owners manual warning. Also, the MBUX screen says if I don’t start the car it’ll shut off in 10 or 30 seconds(sometimes 10 sometimes says 30).
Anyway, I get that the car always has some drain from all the electrical systems, and I get that I can’t be in it and run the ac for an hour with the car off. But sitting in the car for 5 min listening to music on a low level? Do I need a new battery? Is this covered under any warranty? I’ve never had this before. On my X5M the battery is 6+ years old and it gives me no such problems..
Anyway, I get that the car always has some drain from all the electrical systems, and I get that I can’t be in it and run the ac for an hour with the car off. But sitting in the car for 5 min listening to music on a low level? Do I need a new battery? Is this covered under any warranty? I’ve never had this before. On my X5M the battery is 6+ years old and it gives me no such problems..
MBWorld Fanatic!
Joined: Jul 2013
Posts: 2,591
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From: Toronto, Ont, Canda
go fast grocery getter wagon
The car power will shut off in due time as it’s likely by design so you don’t drain the battery completely. It happened to me too.
mb battery is not known to last a long time , I changed mine out at near 4 yrs old due to electronic faults (as aged battery was partly to blame). My Service Advisor was working around the rules and claimed and replaced it under warranty; otherwise it would have cost around $500+ out of pocket
mb battery is not known to last a long time , I changed mine out at near 4 yrs old due to electronic faults (as aged battery was partly to blame). My Service Advisor was working around the rules and claimed and replaced it under warranty; otherwise it would have cost around $500+ out of pocket
Super Member
Joined: Sep 2016
Posts: 751
Likes: 285
From: Los Angeles
2024 GLE63s, 2021 E63s, 2018 GLC43
IME the computer is conservative, it'll give critical battery alerts when the battery still has 50% capacity based on measuring resting voltage, so it'll always be able to start.
The battery is $150 at your favorite Costco or auto store.
The battery is $150 at your favorite Costco or auto store.
Thread Starter
MBWorld Fanatic!
Joined: Sep 2009
Posts: 2,601
Likes: 111
From: LA
W213 E63
MBWorld Fanatic!
Joined: Mar 2006
Posts: 4,278
Likes: 377
From: San Jose area
'19 E63S sedan
Had my battery replaced yesterday, on warranty, after almost four years.
That said, these cars do not fully charge the AGM batteries and a trickle charger is a required accessory. When I get the battery-low alert, I put it on the charger overnight (or sometimes longer) until the charger says it's fully charged. That usually is enough for a few weeks or a month, depending on driving. When it got to the point of not lasting more than a week, they replaced the battery.
Highly recommended:
That said, these cars do not fully charge the AGM batteries and a trickle charger is a required accessory. When I get the battery-low alert, I put it on the charger overnight (or sometimes longer) until the charger says it's fully charged. That usually is enough for a few weeks or a month, depending on driving. When it got to the point of not lasting more than a week, they replaced the battery.
Highly recommended:
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Super Member
Joined: Feb 2019
Posts: 594
Likes: 308
From: South Florida
E63S Wagon
CTEK is definitely the way to go, but after having bought that one, I bought this one and it is so much faster (7amps vs 4.3amps):
One caveat to the trickle chargers is to not use one if you plan to replace your battery under warranty soon. Once the trickle charge tops off the battery, it can take a few weeks for the battery to throw a "critical level" code, which is what you need to have present for a free replacement under warranty.
One caveat to the trickle chargers is to not use one if you plan to replace your battery under warranty soon. Once the trickle charge tops off the battery, it can take a few weeks for the battery to throw a "critical level" code, which is what you need to have present for a free replacement under warranty.
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