The battery in the Mercedes W204 is located in the rear right hand side of the engine compartment by the A-pillar and window base and is covered by a plastic air box. When replacing your battery make sure to use a high quality unit; they tend to last longer than the cheaper ones. Replacing the battery is easy and can usually be done in less than 30 minutes. This is a great job to start your DIY journey. Working safely with your battery is an important aspect of fixing things yourself.
Before disconnecting your battery, remove the key from the vehicle and store it in a safe place and note any radio presets. When a battery is reconnected or loses its charge the following items may need attention, depending on vehicle equipment. You may have to reset your clock, enter radio presets, initialize power windows and initialize the sunroof.
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Time: 30 minutes
Tab: $0 to $200
Tools: 13mm socket :www.pelicanparts.com/Mercedes... and extension,:www.pelicanparts.com/Mercedes... 10mm wrench:www.pelicanparts.com/Mercedes...
Applicable Models: Mercedes-Benz W204 (2008-15):www.pelicanparts.com/catalog/...
Parts Required: Battery
Hot Tip: Store any aftermarket radio codes you may need
Performance Gain: Car starts
Complementary Modification: Change cabin air filter