kbanks45

Quick question, I recently changed my main battery in the trunk. Am I suppose to replace the battery under the hood as well? I just learned I have a second battery...lol I wasn't sure if they both needed to be replaced at the same time.

CDC55AMG

Not necessarily but a good idea to replace them in pairs. The aux battery is much cheaper than the main on the trunk. See attachments for more info. They are for the E55 but is same in many regards to CLS 55.

wally AMG

https://www.ebay.com/itm/143436208377

kbanks45

Thanks for the info guys. It really helped. I'll be picking a battery up this weekend.... The pdf files were awesome....

CDC55AMG

No sweat, glad you made an informed choice. I got the files from bbirdewell over on the W211 forums shortly after I got my CLS55. Glad they helped! Take care.