2019 c300 battery

Now to answer the impending question.... "Yes", my car is still under warranty. You may ask why I purchased my own battery? Well, because of convenience and partially laziness. For about $230 and maybe 30 minutes of my time, I fixed the problem. I didn't have to deal with the hassle and time it would have taken to get my car fixed at the dealership.
Caveat: Main battery fixed my car's issue. Your issue may be different.
I found this helpful.
https://xenons4u.co.uk/blog/mercedes...ode-explained/





