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The 2015 Mercedes CLA 250 auxiliary battery can be found under the floor panel, requiring you to lift up the carpet. Purchasing a replacement battery of this kind typically costs between $110 and $140 at most retailers. In order to install a new battery, you must first remove the old one by disconnecting the negative and positive cables. Once the cables are disconnected, you can access the bolt securing the battery in place. Undo the bolts and carefully lift out the old battery, as it is heavy. When placing the new battery in, secure it with bolts, reconnect the cables, and your installation will be complete.
Underneath the rug and floor panel on the front seat of the passenger side.
Location of the secondary battery is different from the main battery; the vehicle has two batteries.
In the 2015 Mercedes CLA 250, you can find the battery situated beneath the hood. Just search for the big black box with a red and black connection on top.