VibrantShin Posted March 13 Share Posted March 13 I need a battery replacement for my 2011 Class C diesel vehicle, since it has reached its ten-year lifespan, although having only accumulated 50,000 kilometres. Is the primary battery responsible for the start/stop operation, or is it the auxiliary battery located in the trunk? I inquire about this since I refrain from using the start/stop feature and batteries due to their exorbitant cost, which is twice as much. Incidentally, my start/stop feature has been non-functional for many years, which might be the reason why I never use it. Is it possible that this is not functioning properly due to the primary battery being somewhat depleted? Thank you, and I apologise if this question has already been asked and answered several times. Link to comment Share on other sites More sharing options...
Meltarb Posted March 13 Share Posted March 13 In order for the start/stop functionality to function properly, it is necessary for both batteries to be in optimal condition. Recently, I purchased two batteries from Tanya. I found them to be reasonably priced and suitable with stop/start systems. https://www.tayna.co.uk/car-batteries/exide/el800/ Link to comment Share on other sites More sharing options...
VibrantShin Posted March 13 Author Share Posted March 13 Thank you. I have heard that there may be potential complications when removing the main battery if the auxiliary battery is faulty, however I am uncertain about the veracity of this claim. Are there any complications, other than locating a vendor, if I replace the auxiliary battery? Link to comment Share on other sites More sharing options...
Meltarb Posted March 13 Share Posted March 13 There are no problems to be concerned about. However, you may need to reset the windows and mirrors after changing the starting battery. The auxiliary batteries are a very inexpensive solution for the stop-start feature. However, some individuals on this platform choose not to invest in them due to the inconvenience they may cause. Personally, I do not use mine. Link to comment Share on other sites More sharing options...
VibrantShin Posted March 13 Author Share Posted March 13 Another advantage for Tayna. I purchased a Varta battery that is identical to the one originally installed by the manufacturer, at a very competitive price. Furthermore, the battery was promptly delivered to me the following day. Link to comment Share on other sites More sharing options...
AmericaMonster Posted March 13 Share Posted March 13 I highly recommend Tayna. I have had the pleasure of using their services several times and have always been satisfied. However, it is crucial to ensure that you have the correct battery when placing an order, since the responsibility of covering the return shipping expenses falls with you. Furthermore, the cost of doing so is exorbitant. Link to comment Share on other sites More sharing options...
Bitxx Posted March 13 Share Posted March 13 Off-topic interruption! Where is the Auxiliary battery located in a s205 250d? Link to comment Share on other sites More sharing options...
Videoman Posted March 13 Share Posted March 13 The answer to your question is contingent upon your definition of 'the same'. The batteries installed in the plant are solely manufactured by Varta for MB and cannot be directly purchased from Varta. Nevertheless, it is evident that you have the option to purchase other Varta-manufactured battery types that are compatible with your Mercedes Benz. Link to comment Share on other sites More sharing options...
Videoman Posted March 13 Share Posted March 13 In the W205 model, there is usually a capacitor, rather than a large lead acid battery, located under the carpet in the passenger footwell. In addition, a malfunctioning dash will trigger an error notice. Link to comment Share on other sites More sharing options...
VibrantShin Posted March 13 Author Share Posted March 13 Interestingly, the owners manual does not provide any information on the auxiliary battery, and the WIS/ASRA from Mercedes just instructs on how to remove it without specifying data such as its ampere-hour (aH) rating or physical dimensions. Does this imply that altering it is an infrequent and unnecessary activity that does not need discussion? Peculiar. Does anybody have knowledge about this? Link to comment Share on other sites More sharing options...
VibrantShin Posted March 13 Author Share Posted March 13 This video provides a comprehensive demonstration on how to replace the auxiliary component in any Mercedes vehicle, regardless of its location in the trunk. Straightforward Link to comment Share on other sites More sharing options...
VibrantShin Posted March 13 Author Share Posted March 13 Replaced the batteries for both devices and now the start/stop function is operational once more! The one issue encountered was that the breather tube for the auxiliary component is larger than the aperture in the batteries (Exide). Consequently, I resorted to shaving it down and affixing it with adhesive. However, it is plausible that its absence would have little impact in practical terms. Link to comment Share on other sites More sharing options...
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