Car wont start this morning, suspected bad main battery
Thread Starter
Junior Member
Joined: Mar 2019
Posts: 40
Likes: 13
Cls550 2016
Car wont start this morning, suspected bad main battery
I have a 2016 CLS 550 with 17000 miles on it. This morning it won't turn over so I had to borrow my son's Prius. Came home after work and I decided to check the voltage. The multi-meter gave me a reading of 11.6V, way below 12.5 V. Is it pretty straight forward replacing them? I replaced a couple of batteries in my life time but not Mercedes. Do I need to unhook the auxiliary battery in the trunk also? Batteries Plus quoted me for an Optima 36 months guarantee with 800 cranks Amp for $290. Only thing is that they have to special order it. Any tips will be appreciated.
Senior Member
Joined: Jan 2019
Posts: 335
Likes: 103
From: Saddlebrooke, AZ 85739
2013 CLS550 4Matic OE Tuned
You need a sealed AGM battery, not necessarily an Optima. I'd check places like Autozone, Advance, O'Reillys, and even Walmart. Meet or exceed the OE battery CCA. It's a common size and easy to change. You might consider taking it out and having it load tested first. Remove the Negative first and connect it last. Marv
Last edited by Tbbt CLS; Mar 10, 2020 at 12:00 AM.
Senior Member
Joined: Jan 2019
Posts: 335
Likes: 103
From: Saddlebrooke, AZ 85739
2013 CLS550 4Matic OE Tuned
I forgot to say, don't go to the dealer unless they have a massive sale going on. You should be able to get on at the above places for $200ish or less. Most batteries are made by Johnson Controls (though they just changed their name and ownership) including Varta batteries which are the Mercedes OE battery.
