Uneripty Posted January 10 Share Posted January 10 Hello, I want assistance in replacing the starting battery of my 2019 C43 vehicle. Is there a specific procedure to follow or is it just a matter of detaching the old battery and attaching the new one? I remember coming across information that indicates the need of resetting the electronic control unit (ECU) while replacing the battery. I would much appreciate any advise or opinions. Link to comment Share on other sites More sharing options...
Maidaser Posted January 10 Share Posted January 10 To ensure that the battery monitor recognises the installation of a new battery, it is necessary to reset it by connecting to the OBD (On-Board Diagnostics) system. I visited Halfords to get my battery replaced. I was pleased that I undertook the task, since it was rather intricate and required a significant amount of time and effort, resulting in scratched knuckles for those involved. In addition, they had the doodad capable of resetting the battery monitor. Link to comment Share on other sites More sharing options...
Squirrrel Posted January 10 Share Posted January 10 I have changed the batteries for both the C Class and SLC models without resetting any components. I just detached the old batteries and installed the new ones. I have not had any issues with them since then, which was around 3 or 4 years ago. Link to comment Share on other sites More sharing options...
Maidaser Posted January 10 Share Posted January 10 Failure to perform a battery management reset, using a scan tool, upon installing a new battery can cause the system to erroneously see the old battery as still being in place and treat it as a weak, deteriorated battery. Consequently, despite the installation of a new battery, the different components inside the automobile will not be supplied with the whole electrical potential. These issues may result in problems with the car's performance, activation of warning lights such as the charge light, check engine light, ABS light, airbag light, or other warning lights, and the generation of fault codes in several modules. Additionally, it might diminish the lifespan of the replacement battery by at least one year. Therefore, it is preferable to complete the task. Link to comment Share on other sites More sharing options...
Squirrrel Posted January 10 Share Posted January 10 Based on my experience with two distinct Mercedes vehicles, I can confidently state that just replacing the batteries without any other actions has no significant impact. Link to comment Share on other sites More sharing options...
Maidaser Posted January 10 Share Posted January 10 When I changed the battery in my C43 about a year ago, I had an issue where the dashboard displayed many warning messages until the battery monitor was reset. While you may have successfully evaded detection, it is possible that others may not be as fortunate. It just takes two minutes, so it is not too difficult. Link to comment Share on other sites More sharing options...
Boxck Posted January 10 Share Posted January 10 Can charging the old battery overnight before replacing it deceive the system into not detecting the replacement? Inquiring on behalf of an acquaintance Link to comment Share on other sites More sharing options...
Maidaser Posted January 10 Share Posted January 10 I believe that the determining factor is not just related to the charge, but rather to the whole situation. Link to comment Share on other sites More sharing options...
Squirrrel Posted January 10 Share Posted January 10 There was a message from an individual who has extensive experience with these automobiles and said that it is irrelevant, except for BMWs which need it. Link to comment Share on other sites More sharing options...
Maidaser Posted January 10 Share Posted January 10 My experience contradicts that reasoning. Perhaps the outcome is contingent upon factors such as the kind of automobile, software version, and other relevant variables. I prefer prioritising safety above taking risks, thus I would rather delegate the task to someone else. Link to comment Share on other sites More sharing options...
Tactical Posted January 10 Share Posted January 10 +1 ^ Link to comment Share on other sites More sharing options...
Micobe Posted January 10 Share Posted January 10 I apologise for inquiring about this matter, but it is a longstanding concern. What is the reason for replacing a battery that is five years old? Have you attempted to recharge or recondition the battery if it has failed on several occasions? Once again, I apologise, but many individuals choose to change batteries simply because they use their automobiles seldom for brief trips, subsequently discovering that the car is not driven enough to recharge the battery. Link to comment Share on other sites More sharing options...
Squirrrel Posted January 10 Share Posted January 10 Since the introduction of stop/start technology, some batteries have been shown to fail within a period of 3 to 4 years, even if the feature is off and remains unused. For some unknown reason, I have never had to replace the battery in any of my automobiles. Even my last CLK, which was 13 years old, still had its original battery. Recently, my C Class and SLC vehicles need battery replacements before reaching the age of 4. Similarly, both my wife's and daughter's Nissans had their batteries changed under warranty before reaching the age of 3. There are too many occurrences for it to be a mere coincidence. Link to comment Share on other sites More sharing options...
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