Government required 10 years warranty for the high-voltage battery, not sure if 48V battery falls in this category?
the replacement for 48v battery is about $3,000 .

​​​​​​It's 8 years by Fed emissions laws, longer in some States.

I believe the replacement battery is less than $500 installed. Which, as a replacement battery, has a 24 month non prorated warranty including labor. It's only a 0.9 to 1.1 kWh battery.

8 years / 80,000 miles, to expand on mikapen's post.

4 years from the Mercedes Benz German warranty.
It’s in writing.

Toban

$500 is to replace the regular 12v battery. 48v is $3000 which I read from another post.

This will be interesting to read posts on this site when more owners start to face replacement of this battery in MB's dubious 48V system.

​​​​​​Lots of thumb-twiddling until 2027 when the first ones go out of warranty. 🥱

​​​​​​Not many people keep their cars eight years any more.

In the US I believe the 48v system falls under the federal 8/80 emissions warranty for major components.

Uggh....not another 48v battery warranty thread...

I’m betting that given the growing popularity of a 48v system now in cars in general that the aftermarket will catch up with other options by the time we get there. I know I went through two MB aux batteries in my trunk of the w212 before going with an “autozone special” which has lasted a lot longer than any of the MB OEM’s ever did, and for about 65% of the cost.

Agreed. Now c class and GLC are both using 48v system.

it’s certainly gaining popularity thats for sure. Believe BMW has it, and maybe Hyundai and Toyota?

The latest variation on that theme is the 'mild hybrid', with a wide range of car makers, including VW/Audi, BMW, Cupra, Fiat, Ford, Jaguar, Kia, Dodge, Land Rover, Seat, Suzuki and Volvo, offering models with the technology. Most if not all are using 48V. Also freight trucks are using the tech too.

48v is Industry wide.

The reason 48v was chosen is that there are additional protections and warnings required at 60v.

48v charging can reach into upper 50s voltage, still below the threshold.

Slightly OT, but I've been getting 12V battery warnings for about 2 years, now incessant. It's been in twice for this, first 21 months ago, but nothing was done. My car is going in tomorrow for last service before OEM warranty expires next week. I'm going to demand a new battery - what kind of prorate do you think is fair. Original battery has lasted the full 7 years I had each of my last cars.

Update: Car in shop. SA says the 12V batteries only last 3-4 years on current cars!

Second question - does a new battery need to be registered to the car?

12V batteries do not need registration in W213, W205, W166 and other contemporary platforms. It would be a departure for MB to require 12V battery registration in current platforms.

Currently I think I heard the BMW solution is still belt driven and not the ISG type MB uses, that will change for next generation of cars or the coming facelifts.

Hmmm I thought I read although not required to register, it does help resetting it in Xentry to let the vehicle know that the battery is fresh/new so if there were any measures in place that limited system performance prior, it will be removed.

Thing is that it is standard too, you can't have a W206 C-Class and X254 GLC without it I don't think. They are definitely putting a lot of faith on this system. The initial launch since on the V167 GLE was not without issues, rendering the vehicles completely inoperable because the 48V system also powers the engine cooler and also used to start the car but at least now the technology seems to be more mature.

Yup aftermarket will catch up in no time. I wonder if they can also produce batteries that you can swap on electric vehicles but the liability might be too much, think (removable batteries on phones?) that will solve the battery taking too long to charge compared to fueling up gasoline issue, what charges faster than instant swap? Interesting future ahead of us, oh well that might be a pipe dream.

Yup that is true, some beg to differ like Mazda, they used 24V batteries I think on some models.

Yup that is true, some beg to differ like Mazda, they used 24V batteries I think on some models.