Flat Battery Mercedes R Class
Need to buy parts for this project?Mercedes-Benz W211 Models are equipped with two batteries. The batteries in your w211 are an absorbed glass mat (AGM) type, which is different from the older style lead acid batteries.
Flat Battery Mercedes R Class For Sale
AGM batteries house the battery acid in glass mats. Lead acid batteries house the fluid between lead plates.
Mercedes R Class Wallpaper
AGM batteries are made of very thin glass fibers woven into a mat. This increases the surface area enough to hold sufficient electrolytes on the cells for their lifetime.
Lead tends to absorb some of the acid, shortening battery life. There are positives and negatives when using AGM over lead acid batteries. For example, an AGM may charge faster, but is more susceptible to damage from overcharging. They produce less gas than a lead acid battery, can be mounted in any position (do not leak) and are safer for the environment because of this. One downside is the increased cost. Also, charging systems have evolved along with the battery type, allowing greater control of charging current via sensors and computer controlled adaptation.The main battery in W211 models is located in the center of the trunk, mounted in a well, below the trunk carpet.
The auxiliary battery is located in the right side of the engine compartment, near the HVAC intake. When replacing your battery, be sure to use a high quality unit. Replacing the battery can be done in a short amount of time. Read the battery connection notes before disconnecting the battery. Before disconnecting your battery, remove the key from the vehicle and store it in a safe place and note the radio presets.
When the 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 the radio presets, initialize power windows, initialize the sunroof and normalize the steering angle sensor. See our tech article on battery replacing, for info on the main battery and jump-starting.The auxiliary battery supplies power for a limited time if system charging or battery voltage drops. The battery control module monitors system voltage.
If voltage reaches a low point, the auxiliary battery relay closes to connect the battery to the vehicle fuse blocks.Remember that your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users.
Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.Check out our complete for guides to many other procedures.Check out our section, which has all the parts you'll need to get your vehicle running its best, including filters, fluids, brakes, spark plugs, lighting, and more for your W211! This site was designed and produced solely by Pelican Parts. Pelican Parts is not associated with Porsche Cars North America in any manner, except for a mutual appreciation and love of the cars.
All pictures and references to the Porsche name, and the car names and shapes are for restoration reference only, and do not imply any association with Porsche. Pelican Parts is not responsible for any typographical errors contained within the site.
Mercedes R Class 2009
Information and technical articles within this website are for reference only. Consult authorized factory manuals when performing repair procedures. By entering this site, you agree to hold Pelican Parts free from any liability arising out of the use of any information contained within.
Batteries Plus Management has made every effort to ensure the data in this Catalogue (including the Fitment Guide) is accurate. The data has been compiled from various automobile manufacturers.