This just happened to me last month on my 2017 C43 on the OEM battery. I guess five years is typical on these newer MB.
I've had good luck with Bosch (made by Varta iirc) and Yuasa.
the only time it failed me was when the battery died after 100k miles.
Change the battery to a bosch one, I had this issue and my car does 600 miles a week for work took it to toyota and they just kept charging it then giving it back to die again the next Monday morning, they tried to say I wasn't driving it enough until they pulled up the service history (2020 with 54k miles) but they still wouldn't agree to replacing the battery
I use a Group 27 battery in my Mustang and have found Bosch to work very well for me.
Put a new Bosch AGM in.
New battery fitted and all ok for about 2 months, then same problem. Took new battery out (AGM Bosch S5 A08) and charged it on the bench, left it there overnight. Next morning its reading 12.2v.
There is a known random issue with 400 packs. On mine, it is always when I turn on the bike. The speedometer doesn't come on and there is no assist. What I learned about on the internet is to push the test button on the battery with the bike turned on and it will reset and work just fine.
I bought these both for the same exact car but both the box and product appear very different, and the bottom set ended up being ridden with parasitic drain!
Bosch batteries are no poorly made in china
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