MERCEDES W205 / S205 / C205 C-CLASS HOW TO REPLACE BATTERY & ECO STOP START FIXED!

In this video I show you a step by step guide how to replace the main battery on a Mercedes C class W205, I show you which one to buy saving over £200 from a dealer price. I am replacing my battery due to my Stop start function not working since having my auxiliary battery replaced, after the replacement after a short drive it all works again! I did NOT have to code the battery - as confirmed by a mercedes dealership or reset any windows after the battery replacement

Tools needed : Replacement battery
: 13mm socket + extension for battery clamp
: 10mm socket for battery terminal

[williamberne]

This is the video I have been waiting for so long!
My c220d's battery is so old, not just the eco stop is blocked, but it also requires an hour long drive to be recharged, after 2 days idling. I don't think it will make though this winter. But all the videos I found didn't contain so much useful info as yours, so I just kept waiting.
Thank you so much!

[raymondpaylor]

just watched this video, removed my old battery and just replaced the new one with no problems at all, still had all radio stations, all windows worked perfectly, drove the car within 2 miles stop start went to green (first time in 2 years). thanks for video, Ray

[timroberts]

Ive had my W205 2015 for 4 years and the start/stop has never worked. I assumed that it had been mapped out. I watched this video after getting the on screen message, changed the battery and now it works and the message has gone!! Many thanks

[wat]

Excellent video. Just changed my battery on W205 220d. I was dubious about not using a 'secondary' battery but in the end decided that I did not want live terminals getting in the way when I was putting in the new battery. I followed Gavin's video precisely and all went well. Radio and electronic came back on without any problem although I did have my radio code standing by just in case - I've just got to show that the Start/Stop works. I got 6.5 yrs from my original battery and hope that the replacement last as long. Thanks Gavin

[kangill]

Nice video. I manually disable the start-stop each time I drive. Brings back childhood trauma memories of my dad's old Cortina breaking down....lol.

[stevechambers]

Thanks for this, my stop-start hadn't worked since Covid despite putting my battery on a charger overnight and lots of long journeys. Put new battery in and after two miles of driving the symbol turned green for the first time in about 3 years!!

[Harrybollox]

Thanks I used this to change my battery. Here’s a few discoveries for others. The grip that holds the battery in place does not need to be removed, it is on a bracket that rotates forwards to circulate the battery grip/bar out of the way. If you remove that deep bolt fully, it’s overkill, and worse as in my case, that rotating metal bracket under the battery tray can fall out, it’s only held in place clipped into the plastic, you don’t want to have to get it all back together. 
Note the plastic cover that goes up to the windscreen has to sit nicely in the rubber channel under the windscreen to keep water out. . When it first comes out it’s stiff if it’s never beeen removed but it does come out after loosening the two clips. Same with the battery cover itself. It will come out but will be stiff . I suggest tie back the negative cable as it gets caught under the battery when loading it.

[MrKams]

Top video many thanks, can confirm c250d no recoding needed, only difficult part for me was its a tight space to get out, the positive temrnial on mine is a monster needs to be nudged well out of the way to pull battery out. Thank u very much

[RichardStokoe-swsu]

Found this video so helpful...changed the battery, stop start goes green... hallelujah..many thanks...
Used Battery Group..Exide battery...all technicals matched...£133 Inc delivery and terminal grease....previous battery was 8 years old....original part...

[Arsenal-]

Thanks for the video, I just bought a new battery for my c220d, hopefully this will fix the stop start feature. I've asked mercedes to look into this issue previously but they kept on saying the car hasn't met all the requirements for the stop/start to kick in, thinking back it was probably bullshit from them as they probably didn't want to change the battery under warranty.

[mspduk]

So my dad's 2015 C200 is not doing start stop. After reading about it since say its the little auxiliary battery and some say its the main battery. He has no battery related starting issue, so do you think the lack of start stop is linked to the main battery, should be that changed? He has no battery related lights on the dash. Thanks for the informative video though

[Mental_Illboy]

Thanks Mate, I will change my battery tomorrow of my W205.

I don't have the OBD power but reading the comments I see no one gad problems.

Edit: Did it in 30 minutes, no issues. 👍🏼

[Camille-LG]

Thanks mate, Quick and simple explanations.
I replaced my oem 60Ah with a magnetti marelli 80Ah, slighly longer but it fits 😊

[carstenclausen]

Same issue here, changing battery tomorrow after the new one is charged.. Nice video, very usefull, thanks :)

[borderprash]

Thank you for the video, it’s time to change my w213 battery got the check engine light and when I did odb test it showed starter battery has high resistance and when I brought it to my neighboring workshop the technician checked and confirm that the battery level is low 11.6v when idle and 13.5v when ramp to 2000rpm and thus requested me to change the battery which an original Mercedes battery comes to MYR1450 and I contacted my Mercedes dealer and I was told that the price for the same original battery was MYR 2750 and apparently that’s including the reprogramming and they even told me that it will take half a day to just replace the battery. Damm Mercedes is milking money of Their customers. Thank you for confirming that there is no programming needed when a battery is changed now I can just replace it for half the price for the same original battery.

[lordoftheriffs]

Thanks for the helpful video mate.
Our W205 C180 2014MY was bought used from Germany in 2017 apart from 2-3 moments in the beginning start stop never worked. The thing is, the original battery is a 60Ah one for whatever reason, should I replace with a 80Ah like yours? I am leaning towards Yuasa AGM.

[flyingbarbera]

Press the red button on the bonnet strut passenger side and raise the bonnet up to vertical, helps when lifting the battery out 👍🏻

[mrgster]

Hi got a 2018, my stop start don’t work. The battery is at 14.4v but the stop start light is amber on the top right of dash. Should I charge it

[humamhamza]

Hi and thanks for the information.. I wonder why didn't you charge the old(original) battery and see if you really need a new one?
Thanks again

[alexandrubora]

Hi i just change the battery today and still not working the light on dash board is amber !! I should put on charge the new battery? Thanks