2007 R Class Main and Auxiliary Battery Replacement 

Hi Ian, thanks for the comment. To replace the main battery, you can move the seat fully forward but you will need to cut the carpet, which I didn't want to. As for the auxiliary battery, it might be possible to replace it with the seat fully backwards, but I think it would be a major head ache. I find that removing the seat creates plenty of room to work comfortable. Also keep in mind that all R Classes sold in North America are long wheel base. The standard ones I assume are more cramped. Anyways, good luck!

Are you being sarcastic "brilliant engineering"?

You are welcome :). I agree, it could have been done more ergonomically, but I guess they want to force people to go to the dealership and charge them royalty for the service.

Yes, you are right. To access the main battery you don't need to remove the passenger seat. However, for the auxiliary one, you have to do that. For me it's a learning process and I like "to have space" when I work. I tend to disassemble more than necessary, but this will help everyone with a better understanding of how the things are put together.

Thank you for your nice comment. I learn a lot from the internet and giving back to the community is the right way to go :)

Hi @missimani, no, even if the auxiliary is discharged, and the main one is new, you will still be able to drive the car normally. However, at some point, you might get a message on the dashboard to replace the auxiliary. Mine was good to go after 16 years and two main battery changed.

@@ammakayan1747 Anytime 👍

Yes, it makes sense :) The hood is so short and the engine is practically buried half way under the windshield.

Hi Edwin, actually this is a great idea. I don't think it will apply to me, as we are planning to drive the car to the ground and then get a new one :) But if the next car will have the same challenges, I will take this into consideration!

Anytime.

Anytime!

You are absolutely right. I am not looking forward to the next battery replacement on the R Class :):):)

@Konrad's Pages thanks for making the video by the way. Very helpful 👌 I have to do this job on my r class

@@markfitzy.86 You are welcome. That's why the internet exists, we can help each other. As for the job, take your time, pick a day with nice weather and have fun. If you disconnect the passenger's seat, make sure you have a scanner to reset the error code at the end. No big deal, but you need it.

@@konradspages7937 ok o will. Cheers bro

I agree, it is possible for the main battery. If you want to change the auxiliary as well, then it's getting complicated.

@@konradspages7937 I changed both batteries (Main & Auxiliary batteries) without remove the seat. I have 2008 and 2012 Mercedes R350.

@@konradspages7937 I replaced main & auxiliary batteries without remove the seat. I have 2008 & 2015 Mercedes r350.

@@konradspages7937 I changed both batteries. I have 2008 & 2012 Mercedes R350.

It keeps all electronics in the car functioning during the start of the engine, or when the level of the main battery drops too much. I don't know if you are Ukrainian or Russian. This is Google Translate: Он поддерживает работоспособность всей электроники автомобиля во время запуска двигателя или при слишком сильном падении уровня заряда основной батареи.

@@konradspages7937 Благодаря! Българин съм ако това има значение

@@user-xq3rc4me1s I just wanted to translate in your language. For me it is impossible to distinguish in writing Ukrainian from russian, (or Bulgarian) :) Просто исках да преведа на вашия език. За мен е невъзможно да различа писмено украински от руски или български :)

I called a mechanic to change the battery, and we didn't remove the seat, just put it as far forward as possible. Done. Then I started the car thinking I wouldn't see the battery warning anymore: Wrong. Instead of the red battery picture, I got a white battery picture, and found out that my auxiliary (I didn't know I had one) was gone as well. No big deal. A new one costs about $ 60. Then I went to find out where the little battery was located, and found out I had to dismantle the car to replace it. It is under the front passenger feet, and to change it I WILL have to remove the front passenger seat, the door sill, the carpet, and the wall lining (so that I can remove the carpet).

@@ronpinto9588 Hi Ron, yes, you are right. The main battery can be changed by pushing the front seat maximum forward. But for me, it was time to swap the auxiliary battery as well, hence the headache :). Honestly, it is not a difficult replacement, but it is long and cumbersome. I am sure, with a little bit of thought, this could have been done way better. Just pick a nice day, good music and a beer (or a cocktail) and it's actually fun. Fun fact, the dealer quote me $180 CAD and I bought a similar battery from Amazon for $24 CAD.

Best vehicle I’ve ever owned

@@ronpinto9588 don't be so lazy. Its 4 bolts. Are your kids as lazy as their dad ?

@@ronpinto9588Do you also step out of the shower to piss? Lazy twit 😮😮

Hi @AsianBlackR3501, sorry, I have no idea why your comment had disappeared. I am not deleting anything. I have just replied to you a few minutes ago. I hope I didn't do anything by mistake. Actually I am glad when someone uses my videos and manages to get the job done easier and simpler. Honestly, while changing the main battery is possible without removing the passenger seat, I have never heard of anyone to change the auxiliary in the same way. OK, now I am very careful and make sure I just Reply to your message :)

@@konradspages7937 No hard feeling buddy. I did it myself and I know it is possible to do it without remove seat or unplug the connectors. I own 2008 & 2012 Mercede r350 and do most DIY myself. Good job on your video.

If you change only the main battery, there is a way to push the seat forward to the max and then roll the carpet behind it, to access it under the floor. If you need to change the auxiliary, you are doomed, the seat has to come out.

Yes, they are. But they are not perfect :)