Aux battery location
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Junior Member
Joined: Jun 2024
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2017 e400 Estate
Aux battery location
Hello, is the location of the starter battery for the 2017 e400 some kind of CIA eyes only classified document? I've been trying to Google it for days. Forums and all. My auto start stop is intermittent and my car has "insufficient charge for standby mode".
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The OP posted in the wrong forum. This is the W214 forum.
On the W213 there is a large capacitor at the top of the front passenger foot well with functions similar to the now replaced aux battery. It is difficult to access because the glove box and trim must be removed. The W214 location is most likely the same.
On the W213 there is a large capacitor at the top of the front passenger foot well with functions similar to the now replaced aux battery. It is difficult to access because the glove box and trim must be removed. The W214 location is most likely the same.
Last edited by ua549; Jun 2, 2024 at 04:45 PM.
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From: Venice Florida
2018 S560
Generally eco start intermittently working is the starter battery under the hood. They are good for about 5 years. The aux battery is under the passenger dash behind the glovebox and it’s actually a capacitor box.
Thread Starter
Junior Member
Joined: Jun 2024
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2017 e400 Estate
Thank you that makes sense then why I'm seeing 14.8 v on the charging system most of the time. Maybe I'll upgrade to a antigravity lithium battery while I'm at it.
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S-class, E450 W214, E350 W214
Does anyone know if a battery maintainer/trickle charger will charge the auxillary battery/capacitor (along with the main battery) when connected to the normal charging posts under the hood?
Last edited by cruise2024; Jun 3, 2024 at 07:15 PM.
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There is no need (or way) to charge the capacitor. It will be automatically charged once the car is started.
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