12V LiFePO4 Auxiliary Battery Replacement For Mercedes-Benz W221 W212 W164 – N000000004039

If your Mercedes has been throwing electrical gremlins or that 'auxiliary battery malfunction' message, this little 12V LiFePO4 battery might be exactly what you need.

It's a direct replacement for the original, fitting a bunch of models like the W221, W212, and W164 chassis.

We're talking S350, ML320, R320, R500, even the S65 AMG.

The part number crosses to N000000004039, 000000004039, and a few others.

It's a brand-new unit, still in its original packaging, and installation is pretty straightforward.

Plus, it comes with a 2-year warranty, so you've got some peace of mind.

Just match it to your model and get that electrical system happy again.