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12 Volt Battery Issues

Posted: Sun Dec 15, 2019 8:50 pm
by Benzak
My 2014 B-Class Electric Drive has been showing the message "Stop Vehicle See Operator's Manual" randomly during my drive the past couple of months. I see it once every couple of weeks now but goes away after the car is restarted. There is no change in the car's performance. After taking it in the MB dealer for diagnostics, they found the low voltage 12V battery to be the issue and suggested I pay $630 and replace it. I decided I should try and replace it myself. Has anyone had to replace this battery and are there any precautions, sequence of disconnect/connect to worry about?

Re: 12 Volt Battery Issues

Posted: Sun Dec 15, 2019 11:12 pm
by cblankespoor
Hi Benzak,

I posted the following in another thread earlier this year...

"Same thing ["Stop Vehicle See Operator's Manual" warning message] happened to me twice in 1 week about 6 months ago...I replaced the 12V in my car with an XS Power Battery and haven't had any Malfunction visit workshop display message since.

I would suggest getting a really heavy-duty 12V battery...yes, they are more expensive, but with almost everything peripheral in our Bs running off that battery, it will be money well spent!


P.S. The XS Power 12V AGM 2900 Max Amp Car Audio Battery D4700 is the one that fits. And don't forget to purchase the terminal hardware, as it doesn't come with the battery.

Re: 12 Volt Battery Issues

Posted: Tue Dec 17, 2019 8:46 am
by JeffRay

Whenever my mechanic has replaced the 12V in my B250e or E500W for that matter, some other electrical doodad gets messed up. So sequence may be important. Not to say the dealer mechanic will be immune but all in all, it should not take more than one hour labor so that is what you save by doing it yourself and you can choose a lower cost batter.

Examples I have experienced were: error message, sun roof in wagon would not work.

Perhaps there is a YouTube video but find one for our B250e. Remember, with ours, keep the Drive Unit and big battery safe.

Re: 12 Volt Battery Issues

Posted: Sat Jan 02, 2021 6:15 pm
by WantOne
My time has come with my 2014 B class. On both 12V issue as well as drive motor replacement.

What are the 12V battery people are using? Dealer charges $650 for it of course but offered to installation only if I provide my own parts.

I saw the XS Power D4700 suggestion from @cblankespoor. Any other suggestions? Firestone website pulled up interstate batteries MTX Article #7015379 not sure how well it’s going to fit our b class.

Suggestions? Thanks!

Re: 12 Volt Battery Issues

Posted: Tue Jan 19, 2021 6:27 pm
by WantOne
Responding to my post. Went with dealer batter at about $350 + tax as I’m also doing tesla motor replacement. I’m hoping the new motor will last > 5 years so that this is not end of the road for b!

Re: 12 Volt Battery Issues

Posted: Wed Jan 20, 2021 12:36 pm
by JeffRay

Yes, wish your B250e a long renewed life with replacement motor. I don't miss it as much because the only driving I do these days is to take the kids to school a couple of times a week and otherwise be the family Uber driver (errands, shopping, etc). Using my wife's ICE wagon and fill up once a month.

Things should be different in 2021 so as per my other post, will look at MB EQA when it comes to the US. No rush but I did send a note just now to my MB salesperson.