E-Class (W211) 2003-2009

W211 2007

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Old Jul 15, 2023 | 07:22 PM
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W211 2007

I will be leaving the car at home when I eventually go away for a few weeks. Has anyone any knowledge of the cigar lighter solar charging plug in devices. Will they work on the W211 to prevent coming home to a flat battery.

Your advice would be much appreciated.
Regards
John T
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Old Jul 15, 2023 | 09:16 PM
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2008 E350 4Matic, 2011 E350 4matic
Shouldn't be an issue for a few weeks. If you're near an outlet, you can just throw a battery charger on the battery for a few hours when you come back and it'll be fine.

The solar charger might work, but you'd have to move a fuse in the fuse box. Normally the cigarette lighter is off when you remove the key so the solar battery charger won't charge if it's plugged in, but you move the fuse and the outlet will still be on even when the car is off.
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Old Jul 16, 2023 | 03:14 AM
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2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
FYI/FWIW—
I used to leave mine at the airport for up to a month while on international business trips. The electrical system in the car begins shutting off parasitic loads after parking for an extended period to preserve starting power. It begins the wake-up when you unlock and open the driver’s door. I was always able to start on return.

But if you can use some sort of trickle charger, it removes any question. I haven’t had the W211 for almost a decade and can’t get to my shop data, so maybe someone else can supply the fuse move info you need.
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Old Jul 17, 2023 | 04:36 AM
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There are a couple of threads that Ive read (sorry tried to find them but couldn't) where people have used the front cigarette lighter to trickle charge and thats ended in problems. That connection is not always live so you end up sending charge to modules as opposed to the battery which stresses then out. Potential fried front SAMs as a consequence.

Your best bet is to use the terminals under the hood. Some have noted that the 12v socket in the rear luggage area, which is always live was a solution for them. Pretty sure I saw this post in the last few days.
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Old Jul 17, 2023 | 04:44 AM
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2010 ML550 VIN WDC1641722A564750, 2010 B180
Here's the thread I referred to about charging through the front 12v socket and problems caused.

https://mbworld.org/forums/r-class-w...nit-start.html
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