MERCEDES W205 / S205 / C205 C-CLASS HOW TO REPLACE BATTERY & ECO STOP START FIXED!

In this video I show you a step by step guide how to replace the main battery on a Mercedes C class W205, I show you which one to buy saving over £200 from a dealer price. I am replacing my battery due to my Stop start function not working since having my auxiliary battery replaced, after the replacement after a short drive it all works again! I did NOT have to code the battery - as confirmed by a mercedes dealership or reset any windows after the battery replacement
Tools needed : Replacement battery
: 13mm socket + extension for battery clamp
: 10mm socket for battery terminal
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[@williamberne]

This is the video I have been waiting for so long! My c220d's battery is so old, not just the eco stop is blocked, but it also requires an hour long drive to be recharged, after 2 days idling. I don't think it will make though this winter. But all the videos I found didn't contain so much useful info as yours, so I just kept waiting. Thank you so much!

[@GAVINHR]

Hi William, thank you for taking the time to watch my video. The thing is. The battery was working fine for normal operation however I think they just lose enough juice to kick the start stop in. Thank you for the compliment, of course there was a moment where I worried if it would solve the problem and if I had purchased a battery for no reason but it was sure the issue! And such a simple DIY.. especially now it's confirmed the battery does not have to be coded as some claim! Appreciate the comment thank you.

[@williamberne]

@@GAVINHR I have changed my car's battery before the winter came, and it worked perfectly! No need to worry about if it will start after several days of sitting still in low temperature any more. Thank you again!

[@GAVINHR]

Hi William, thank you for reporting back to me, I am very glad this worked, yes indeed it was the same with my battery under normal circumstances it worked absolutely fine but as you say they just lose the juice to run the start stop! Glad you found it helpful and happy motoring !

[@Jim.Thunda]

Just wears out your starter motor and solenoid. If its got turbos and you hit the city after a long run the engine shuts down while the turbos are still red hot, no cooling oil circulation. Benz don't care if you cook your seal's.

[@raymondpaylor5092]

just watched this video, removed my old battery and just replaced the new one with no problems at all ,still had all radio stations , all windows worked perfectly, drove the car within 2 miles stop start went to green (first time in 2 years). thanks for video, Ray

[@GAVINHR]

Hi Ray, super pleased to hear that it worked for you and that you found the video helpful. Thank you for watching

[@siiNke]

Did you just move key away from the car or did you do something else before taking it out?

[@jamesb4263]

Did you not have to programme the new battery? Ive heard in some models this is required

[@GAVINHR]

Answered in the video James :) no it’s not required and dealers don’t code the battery in

[@timroberts2919]

Ive had my W205 2015 for 4 years and the start/stop has never worked. I assumed that it had been mapped out. I watched this video after getting the on screen message, changed the battery and now it works and the message has gone!! Many thanks

[@GAVINHR]

You're welcome!

[@kangill2411]

Nice video. I manually disable the start-stop each time I drive. Brings back childhood trauma memories of my dad's old Cortina breaking down....lol.

[@GAVINHR]

haha! bad times! To be honest I used to disable it all the time - now I quite like it!

[@Harrybollox]

Thanks I used this to change my battery. Here’s a few discoveries for others. The grip that holds the battery in place does not need to be removed, it is on a bracket that rotates forwards to circulate the battery grip/bar out of the way. If you remove that deep bolt fully, it’s overkill, and worse as in my case, that rotating metal bracket under the battery tray can fall out, it’s only held in place clipped into the plastic, you don’t want to have to get it all back together. Note the plastic cover that goes up to the windscreen has to sit nicely in the rubber channel under the windscreen to keep water out. . When it first comes out it’s stiff if it’s never beeen removed but it does come out after loosening the two clips. Same with the battery cover itself. It will come out but will be stiff . I suggest tie back the negative cable as it gets caught under the battery when loading it.

[@wat2349]

Excellent video. Just changed my battery on W205 220d. I was dubious about not using a 'secondary' battery but in the end decided that I did not want live terminals getting in the way when I was putting in the new battery. I followed Gavin's video precisely and all went well. Radio and electronic came back on without any problem although I did have my radio code standing by just in case - I've just got to show that the Start/Stop works. I got 6.5 yrs from my original battery and hope that the replacement last as long. Thanks Gavin

[@GAVINHR]

You're most welcome! Well I'm a little while on from this video now and it still works perfectly!

[@stevechambers181]

Thanks for this, my stop-start hadn't worked since Covid despite putting my battery on a charger overnight and lots of long journeys. Put new battery in and after two miles of driving the symbol turned green for the first time in about 3 years!!

[@RichardStokoe-sw3su]

Found this video so helpful...changed the battery, stop start goes green... hallelujah..many thanks... Used Battery Group..Exide battery...all technicals matched...£133 Inc delivery and terminal grease....previous battery was 8 years old....original part...

[@Living-N-socal]

This answered all my questions. Very useful. Thank you!!

[@Mental_Illboy]

Thanks Mate, I will change my battery tomorrow of my W205. I don't have the OBD power but reading the comments I see no one gad problems. Edit: Did it in 30 minutes, no issues. 👍🏼

[@deefloyd9148]

Smashing video, my start stop stopped working, then the dreaded auxiliary battery message, spoke to a Mercedes specialist, he told me the auxiliary battery isn’t being charged due to battery, as well as start stop, due to replace my main battery next few days, hopefully it sorts both out…. Thanks for the video

[@ThinhTran-hg5mh]

Thanks for this helpful video. Appreciate your enthusiasm!

[@rodneydlamini7364]

Thanks for sharing,I really did not know where the main battery was

[@borderprash472]

Thank you for the video, it’s time to change my w213 battery got the check engine light and when I did odb test it showed starter battery has high resistance and when I brought it to my neighboring workshop the technician checked and confirm that the battery level is low 11.6v when idle and 13.5v when ramp to 2000rpm and thus requested me to change the battery which an original Mercedes battery comes to MYR1450 and I contacted my Mercedes dealer and I was told that the price for the same original battery was MYR 2750 and apparently that’s including the reprogramming and they even told me that it will take half a day to just replace the battery. Damm Mercedes is milking money of Their customers. Thank you for confirming that there is no programming needed when a battery is changed now I can just replace it for half the price for the same original battery.

[@Camille-LG]

Thanks mate, Quick and simple explanations. I replaced my oem 60Ah with a magnetti marelli 80Ah, slighly longer but it fits 😊

[@jjimkhd6191]

Absolute legend. Well done mate 👍

[@GAVINHR]

Thanks 👍

[@rogeriosilva5074]

This video answered all my questions, thanks

[@GAVINHR]

Thank you for watching 🙂

[@MrKams1]

Top video many thanks, can confirm c250d no recoding needed, only difficult part for me was its a tight space to get out, the positive temrnial on mine is a monster needs to be nudged well out of the way to pull battery out. Thank u very much

[@jameswhitfield2878]

Great DIY Video Tutorial.Thanks

[@Arsenal-81]

Thanks for the video, I just bought a new battery for my c220d, hopefully this will fix the stop start feature. I've asked mercedes to look into this issue previously but they kept on saying the car hasn't met all the requirements for the stop/start to kick in, thinking back it was probably bullshit from them as they probably didn't want to change the battery under warranty.

[@stevebutler9315]

viewing from August '22, apart from a great tutorial, its nice to see some rain.

[@staghabo]

Thank you very informative...

[@kaj661]

Top video, and what a car too 🔥

[@thepatientone1127]

Great video man

[@GAVINHR]

Appreciate it

[@latoyaeverett5307]

OMG! FUCKING FIXED IT !!!! THANK YOU A BUNCH! YOUR LEGACY WILL NOT BE FORGOTTEN 🙂

[@rahulricardo4941]

Very useful thank you

[@carstenclausen4414]

Same issue here, changing battery tomorrow after the new one is charged.. Nice video, very usefull, thanks :)

[@GAVINHR]

How did you get on?

[@carstenclausen4414]

@@GAVINHR Battery changed, no issues, but no start/stop so far.

[@GAVINHR]

Have you turned Aircon off?

[@carstenclausen4414]

@@GAVINHR Not i have not tried that much yet, weather here is crazy, so have not been out driving yet.

[@GAVINHR]

Ah ok man! So you changed it but not drove it? Yeah make sure Aircon is off also go for a drive and in a minute or so it should come on

[@dicky3001]

Cheers bud..hope my does the same when I replace it shortly..merry Christmas.

[@GAVINHR]

You too Richard! It should well do!

[@trevorweston9646]

Hi please can you show how you took the plastic covers off to get at your battery also the other side to get at the fuse box many thanks Trevor

[@krumzlatanov2852]

Hi, nice video mate👍 do you have a video how to replace front head lights ( led bulbs) . Thank you

[@vampirebd2001]

I have the same issue and I was told the same thing from dealership . Auxiliary does day after my warranty finished

[@B4UREZA]

AWASOME BRO👌

[@abel238]

I have the same car as you excepted it is a coupe C class 2017 diesel, I been told by mercedes to put a Gel battery otherwise with time the AGM battery might cause some trouble in the system. Could you help on this one please?

[@ujuice]

The side little hose was not connected in mine i have now changed the battery and could not even connect it either it's so tight 🙂 but stop-start works now 😁and I could not fit the battery retainer lol half and half job myself, but i will get that sorted

[@gazm100]

When you changed the auxiliary battery (capacitor) did the warning message disappear straight away from the dash as I’ve put a new one on mine from Mercedes but still comes on the dash as auxiliary battery malfunction?

[@kravez16]

I’ve just opened the battery cover up to my c220d coupe and it has a large black vent over the batter which was missing in your car?

[@stefanolschewski]

A simple LIKE ist not enough: Thank you very much!

[@davyvoortmans5678]

Top video

[@akiflevent]

can we use EfB Battery instead of AGM for c180 (gasoline vehicle not diesel)

[@alexandrubora7384]

Hi i just change the battery today and still not working the light on dash board is amber !! I should put on charge the new battery? Thanks

[@Aqueeel1]

I got C350e with battery malfunction. And hybrid range has came down to 7 miles from 16 miles just before the malfunction appeared. Don you think the battery malfunction I am getting is for 12V battery.?

[@mytube22255]

Auxiliary battery malfunction, changed to new Merc battery, still Eco is amber and start/stop not working. Appreciate any suggestion.

[@jamesmallon6783]

Hi, Why can I only watch 3 of the vids for the mersedes. The others aren't available?

[@miguelangelmillaresperez3237]

Gracias desde España

[@DarkMso]

i have the same problem right now with the start stop system not working since 2 years… .but it doesnt bother me cause i hate it. BUT since 2-3 months i get a new problem. Everytime i start my car from cold the dashboard turn for 1 sec total blackout. As soon as the motor is started its all fine again. Does this "symptom" come from low battery? i hope you can help

[@datatrax1966]

On my glc 250 I have the same problem but not only that .. the self park no longer works either. Been told by Mercedes it’s due to the low voltage on the battery too.

[@techsquared_]

Hey dude, i have a w205 but when i imput my car registration it says the model is not compatible?

[@amjadkhan-jv6xj]

Please correct me if im mistaken , i have a c class 2017 w205 and its battery is in the boot.

[@brandonxu1262]

I have the same problem,stop start function not working since 17 months ago having my auxiliary battery( capacity） replaced, I just thought the dealer turned off the function.Now my car says"Stop vehicle,leave engine running"that's mean the battery's capacity is low,but after 50 mins it still here,I realized it's been 5 and half years,it's time to replace the old battery.

[@GAVINHR]

Replace the battery and it will all work again ☺️

[@brandonxu1262]

@@GAVINHR I appreciate it!

[@brandonxu1262]

@@GAVINHR I used multimeter to test the car this morning. Got 12.65V,then I started the car, got 14V. So looks like either the battery and alternator are all good. I am confused, the auxiliary battery(capacity) died again?

[@hudorim]

Kann es sein, dass der Start-Stopp-Modus aufgrund der Pufferbatterie nicht funktioniert?

[@Rezy42]

Hi Gavin....can I top up charge whilst battery is connected to the car.....or should I remove first....cracking video mate ....sound information

[@GAVINHR]

Hi there , yes you can do if needed but I would prefer to do it off the car ideally. Haha thanks! I'm certainly much better at making videos now than I was here but it does the job !

[@AndrewJamesFilms]

Nice video matey!

[@GAVINHR]

Thank you very much

[@AndrewJamesFilms]

GAVINHR are you going to the next kans meet ?

[@GAVINHR]

Yes I will be ! I'll be taking the skyline again, were trying to get a group of skylines together

[@AndrewJamesFilms]

GAVINHR awesome ! I’ll be sure to capture that then. I might actually bring my swift down this time lol

[@calonzo67]

I read that you only need to tell the computer you changed the battery if you change the type of battery. Since you replaced it with the exact same type of battery, you don't need to code the battery.

[@GAVINHR]

Yeah that seems reasonable, as I say in my video I did ask a dealership first before I did anything regarding the coding but they confirmed it's not needed so a big bonus! 👌

[@il.k3n]

Vorrei capire come cambiare lo specchietto (tutto il pezzo con i cavi)anteriore mercedes classe C w205 del 2015 ... can you help me?

[@korpharm]

Great video. I changed the Auxillary battery myself (20min job) which cleared the error but still no stop start. The main battery is original but down to 12.2V so I’m going to change it next. Was wondering about whether a new battery needs some coding and happy to hear from you that it doesn’t.

[@GAVINHR]

Nope I had it confirmed with the main dealer after myself receiving multiple conflicting information regarding coding but 100% does not require coding. I had the auxiliary malfunction then after that was sorted start stop never worked even though it sometimes did before that. Now it worked all the time.

[@George-1939]

What's all this talk of an auxiliary battery? To my knowledge there's a main battery but the stop/start also uses a capacitor which is located in the passenger foot well behind the LH trim panel - it rarely goes wrong. Which raises the question, if the main battery produces volts why doesn't the capacitor still charge to enable stop/start? There must be some electronic trickery that monitors the main battery voltage and disables the feature below a preset voltage so that the battery is saved for actually starting the car from cold.

[@lordoftheriffs79]

Thanks for the helpful video mate. Our W205 C180 2014MY was bought used from Germany in 2017 apart from 2-3 moments in the beginning start stop never worked. The thing is, the original battery is a 60Ah one for whatever reason, should I replace with a 80Ah like yours? I am leaning towards Yuasa AGM.

[@GAVINHR]

Save yourself some money and get one from halfords if you're in the UK, Halfords battery's are Yuasa! I've never seen them as low as 60Ah, I've seen some 70Ah in cars but not 60! I'd give your reg a check and just make sure!

[@lordoftheriffs79]

​@@GAVINHR nah mate I am from Greece, the cheapest 80Ah AGM is Bosch at 160 euros, which I think is trash. Yuasa (any Japanese brand) never failed me

[@GAVINHR]

Ah ok man! You see in the UK the yuasa rebranded Halfords batteries are like £140 so a good deal here! Well hopefully you get sorted, crazy how fast these batteries go bad! Still more than enough to start the car but the start stop capacity drops quickly it seems!

[@lordoftheriffs79]

@@GAVINHR considering the first owner used the car for only 6 months and then it sat for 1.5 years until us purchasing, it is a miracle it starts right on. These cars are full of power hungry electronic gizmos and a 60 ah has no place there, wonder they did it for less weight and thus C02.

[@glasser2819]

@@lordoftheriffs79 seems Bosch's world champion for short lived parts and Japanese the opposite... 👍

[@humamhamza4437]

Hi and thanks for the information.. I wonder why didn't you charge the old(original) battery and see if you really need a new one? Thanks again

[@GAVINHR]

I'm sure I said that in the video? It was a fair few months ago now but actually I did. I charged the battery fully about a week before this video to see if it made any difference, the battery within a few moments showed as fully charged, it is the battery which loses its capacity over time so in terms of the power which it can hold it may still be full but down to age doesn't actually hold the amount when it was new.

[@glasser2819]

@@GAVINHR true, it seems these AGM's loose capacity as they age with deep cycling by ECO ON/OFF. They keep working well but behave as if they'd becomed 1/2 sized when the internal plates have sulfate buildup.

[@MALL07]

I don’t know how true this is but Halfords refused to change my battery due to it there’s an airbag fuse right on it and it could’ve triggered the airbags in the car at the point of changing on Merc C45

[@SANDUGOUsapangofw]

would this be same procedure for the C220D? I had the same problem my stop start stopped working and the auxillary battery warning is popping out my dashboard.

[@GAVINHR]

Hi there - Yes it is the same, Mine is a c220d

[@jakub1280]

Nice video, do you have to charge new battery before you change?

[@GAVINHR]

Normally no, I did anyway but as soon as I put it on charge it showed it was 100% so jst popped it on the car

[@Drazorig2]

Have the same issue on my w205 petrol model. Start stop has never worked since I've owned it. Also didn't drive much during lockdown and the Shift to P message keeps popping up. May just change the battery to see if it solves the problem.

[@GAVINHR]

Just remember also if you have your air con turned on that draws a lot of power so try turning that off first - if not change the battery and it should fix it 👌

[@Drazorig2]

@@GAVINHR cheers, unfortunately being in England it's either my heating/heated seats are on full in the winter or AC always on in summer. It's only off In the spring! Never had battery issues or start stop issues with my W204. Was thinking the start stop function on the W205 was a myth after a year of ownership.

[@TheTomhandley]

Great vid thanks! After changing the battery as you did (in same model Merc) I lost the start stop indication in the top right of the cluster screen. Any ideas?

[@MrDavidchuck]

Any fix?

[@TheTomhandley]

@@MrDavidchuck my battery control module was at fault.

[@MrDavidchuck]

@Thomas Handley .. auxiliary, you mean. And yeah, those are usually the culprits for whenever something is wrong with these Mercs, especially nowadays, electronically. Main battery, auxiliary, or one of the SAM modules. And in most cases CAN become tedious because they CAN spontaneously become faulty and at any moment, costing nowhere near cheap for repairs/replacements. My apology for all of this yapping though lol I’m a tech for Merc.

[@mariog5598]

@@MrDavidchuck hi can I ask you a question MrDavid since you said you are a merc tech???. My car is a 2015 w205 c250 and it has developed a ramdom jerk when you accelerate softly, say you are driving around and crusing at 50 km/h and bang you feel the car jerks, something like a misfire, initially I thought it was the transmission itself 722.9 but it showed no codes when they replaced the oil, engine also showed no codes. I am now thinking more along the lines of the battery, the battery has never been changed since new 2015 and Car has 80Km. The Eco function works ok, I really hate the feature. Do you think the battery could be causing the car to jerk? Or the plugs??? I am so sorry for hijacking this thread here Thanks for your help in advance.

[@MrDavidchuck]

@Mario G .. anything electronically that malfunctions points back to any or all of the electronic sources (being battery, alternator, auxiliary). Meaning that it can actually still be engine related. I’d do a much better job telling you what the issue is if the vehicle were to be in front of me. And I’m saying that because it ranges from many possibilities what the issue is that you’re dealing with. But from how you’re describing it, it’s definitely spark related. If getting them cleaned or replacing them with new ones doesn't help, then you need to adjust your fuel levels. You’re probably running too lean.

[@franciskennedy1782]

Hi great video, I changed my battery and alternator is ok no need to change, I’m changing my aux battery tomorrow, but my issue is that sometimes when I start my girl up she doesn’t ignite, but when you let go of the key she fires up, any ideas? 👍👍

[@glasser2819]

is this a gasoline or diesel engine? What mileage now? Have you scanned it? Basically you dont want any active fault as it introduces incremental lag delay in the calculator response that need to be microseconds precise while engine running. This is sneeky. Of course battery needs to be in condition as well.

[@franciskennedy1782]

Hi thanks for your help, my car is a diesel, and had a new capacitor and new battery, that’s got me thinking it’s the starter motor.

[@CaboSteveJ]

Just confirmed for an 2018 A205 in the Workshop Manual the following item: "13. Confirm battery change in front SAM control Model 205 (except 205.012/047/147/212/247), unit in the Actuations menu item.213, 253 except code U98 (LITHIUM-IONEN-STARTERBATTERIE (LISB)) When replacing the on-board electrical system battery (G1). " Same for W205. This to prevent over charging of new battery. TOPDON AL600 OBD2 Scanner code reader with Active Test |ABS&SRS Diagnostics| Car Maintenance Reset Service of Oil, BMS (Battery Maintenance System), SAS| Full OBD2 Functions | Lifetime Free Update | LED Lights.

[@muzzicman03]

how does the cover part come off next to the windscreen is it held in place than more than the lock pins

[@GAVINHR]

Turn the front lock lift up then pull towards you

[@muzzicman03]

I tried that but seems to be stuck and checked to see if I had opened all the locking pins and I had

[@Top.1527]

mercedes benz cla 250 2016 when make a complete stop sign after a few seconds the car automatic go on neutral why

[@mspduk]

So my dad's 2015 C200 is not doing start stop. After reading about it since say its the little auxiliary battery and some say its the main battery. He has no battery related starting issue, so do you think the lack of start stop is linked to the main battery, should be that changed? He has no battery related lights on the dash. Thanks for the informative video though

[@arturthoma8727]

Same here but decided not to bother about start stop not working. When the main battery dies completely then yes.

[@dekkerlundquist5938]

When you change the battery on a W205 you need to reprogram the Battery Management System (BMS) to tell the car that the battery is new. Its important because the car adjusts the amount of charge it puts into the battery as the battery ages. Hence, if you put in a new battery but do not reset the BMS, the car will overcharge the battery for its young age, reducing the life of the battery in the future. Many scan tools can be used to program the BMS (e.g. XTool D8).

[@GAVINHR]

Watch the whole video next time I specifically mentioned that the Mercedes main dealer do not do this step.

[@dekkerlundquist5938]

@@GAVINHR I did. The two Mercedes Benz dealers I spoke to here both say its an important step that can lead to reduced battery life if its skipped. I would get my advice from another dealer if I were you.

[@joeduffy3309]

@@dekkerlundquist5938 Yep, my merc tech told me the same, as did my indy,,,but hey, this guy read stuff on the internet. Plus most mercs with stop/start do indeed have an auxiliary battery, mine is in the booth where the spare wheel would be. Its a small motorbike type battery

[@vitalijssvecovs9575]

After I watched video and after that see that comment I gave a call to dealer and they confirmed after battery replacement you have to reset computer on a car otherwise it will overcharge your new battery which will kill it quicker.

[@valentinennannah4874]

Hi and thanks for the video. Mine shows stop car and shift to P im guessing the battery is low aswell. Where did you buy your battery from.. thanks

[@GAVINHR]

I just bought it from a automotive parts store Halfords, any AGM 115 battery will do you !

[@valentinennannah4874]

Ok thanks alot. Its 150 you paid right

[@GAVINHR]

I did indeed!

[@aq167]

In my e300 I suppose to charge the car with another battery while changing the main battery that what dealership said

[@glasser2819]

it's a good idea to use backup power do you don't loose your radio presets plus additional computer pain. I simply use me bench power supply dialed to 13v with car completely shutdown (else it an suck 30Amp with ignition ON) 👍

[@jamesb4263]

I have a c350c (2016)and stop start isnt working at all . The car wont even go into emode . Should the auxillary battery in the boot be replaced or is it another issue ? Its annoying having hybrid car and having to drive in petrol .

[@GAVINHR]

That sounds a wider issue I’d certainly contact the dealer for that one

[@kunalrana3625]

Hi I have the change to p leave engine running sign up on my and spent around £100 changing the voltage converter and the next day the sign has come up again. Was wondering if this could be the main battery start stop does not work either. I have took to Halfords to test battery he said the battery is fine and took to second garage he said batt needs changing as on 35%. Was wondering if it could be the main battery and before replacing to a new one is it possible to charge the old battery and reinstall that or best buying new one? If so was looking at the Bosch s5 a11 if this is a good batt. Thank you.

[@GAVINHR]

It's more about batteries losing their efficiency over time. So you could have the battery on charge but due to age it will not charge to the correct amount required to activate the start stop. I would suggest the Halfords AGM 115 battery it's a straight replacement ( please check ) and it's actually a yuasa battery. I think the main battery is the problem and will of lost some of its capacity over time.

[@rinorajvazi9550]

Hello my friend l have a w205 c 250 cdi 2015 l have same problem start and stopp button won t work the volt off battery is 11.9 should l change it or charge it ? What do you think how much volt had you on your old battery ??

[@GAVINHR]

I had around 12, the battery in itself worked fine and always started the car but clearly it lost enough capacity for the start stop. Before I changed battery I charged it up to see if it made a difference and it did not. As soon as I replaced then my start stop worked

[@jm-gb2bg]

Hi Gavin, How are you? I have a malfunction with gears warning popping up. After a lot of observations, i think it is because of the start/stop. My car is 2016 C350e. After the warning (malfunction with gears) comes up, the start/stop does not work (engine is always on even when stopped at a traffic lights). Please help. Thank you.

[@jm-gb2bg]

mercedes

[@mrgster4889]

Hi got a 2018, my stop start don’t work. The battery is at 14.4v but the stop start light is amber on the top right of dash. Should I charge it

[@mrgster4889]

I have no faults in dash

[@MonsurRa]

Same thing here I charged it and it worked for a week then stopped so it’s better off getting a new battery as these new batteries last 4-5 years

[@andybowie8590]

First thing I do every time I start my car is turn the stop start (or eco as they call it) OFF. I've said since cars started getting these systems fitted that they must shorten the life of not just the battery but the starter motor as well. Unless you spend more time sitting still than moving the gain in fuel economy isn't worth it, not with a new battery being £150 and god knows how much for a starter which most people wouldn't fit themselves. I guess the only upside is that when it stops working it's early warning that the battery is on its last legs.

[@philbeighton6448]

I turn mine of on my 204 coupe, I just find it annoying. I’m sure it doesn’t do much for your starter motor either

[@aminkhan1292]

How long does it take to go green, i installed mine mainly done city driving, still amber woth the cross

[@GAVINHR]

Amin, is your aircon on? Turn it off if it is and give it another go

[@BMackQ]

How old was the battery before you changed it? PS: nice job, well done!

[@GAVINHR]

Hi there, probably about 3.5 years old

[@Mickytdi]

It didn’t last long!

[@classycarhire]

Hi Gavin, I recently fully charged the battery. My stop start is amber and I noticed hold brake is not working. Any advice

[@GAVINHR]

Yep, even if you fully charge it it's likely it's lost its capacity if it's a few years old - time to change it sadly

[@classycarhire]

@@GAVINHR can I upgrade on the battery and use 95 amp instead of 80 amp

[@MelanieBella]

Had change the battery on a c300 2015 drove it a few blocks and when I turn in the start/stop button the whole car stop… now my car won’t start. When I turn the ignition on everything thumbs on, lights power windows, but it won’t start the car.

[@GAVINHR]

That is very odd ! loose connection maybe?

[@AnthonyPaulus-ub6mx]

Just to say in my case I've got a 2011 C220 CDI W204 model and when I turn the key the ECO green light comes on with the ECO in yellow on the dash. But as soon as I start the engine both the light and the ECO display then turn off and stay off until I stop the engine and then turn the key again. I must say this has only started happening since I just had my car serviced. I replaced both my main and boot batties in November of 2021 but I don't think the battery in the boot or the front engine bay is the issue as I say all was working fine until it went in for recent servicing. So I'm at a loss as to what's wrong and I don't want to fit a brand-new battery and still end up with the same outcome. So any suggestions as I said everything was fine and now ECO just turns off every time I start the car.

[@AnthonyPaulus-ub6mx]

Update in my case replaced with band new battery and I've still got the same problem. Turn the key and ECO in yellow comes up on the screen and the green light on the dash. But as soon as you start the engine both the ECO and light shut off after a couple of seconds. so it's not a battery issue so will continue to look into this and update you on what I find. So don't always go rushing out for a new battery.

[@AnthonyPaulus-ub6mx]

A further update I've changed the battery relay in the boot and even tried using my old boot battery which I knew to be good and still I've got the same issue ECo turning off after starting the engine. So now I'm at a complete loss as to what's wrong. Will now book the car into Mercedes to have them check the car out on the STAR diagnostics system to find out the true fault as it's not battery-related at least in my case it's not.

[@carlossevillanor]

Is it necessary to update the software so that the alternator charges differently?

[@GAVINHR]

This question is answered in the video

[@carlossevillanor]

@@GAVINHR thanks for the video!

[@RadovanBihary]

I need a help. Week ago my car show "stop car and leave engine running". So I changed main battery (by myself). Since then car shows "BATTERY NOT CHARGED" or "CHARGE BATTERY". The new battery is the same as old one, fully charged. Where is the problem??

[@glasser2819]

I bet you have ALTERNATOR issue... simply replace the "Brush/Regulator" spare part... a lot cheaper than buying an old rebuilt unit. 👍

[@RadovanBihary]

@@glasser2819 Just erased error logbook and all is ok

[@glasser2819]

@@RadovanBihary I'd be surprised if this problem doesn't come right back. Erasing code is often very short lived repair... 🤗

[@David-ko2kc]

just wondering did you use a memory saver when changing the main battery? If not, did you have any memory lost (ie. raido stations, GPS location, or anything stored in your computer)? Thanks!

[@GAVINHR]

Hi, I did answer this in the video ☺️ no lost memory, clock gps window settings were all fine afterwards

[@Top.1527]

When I make a complete, stop, my car automatic, go neutral

[@tigerali7]

Anyone can help me locat 2017 e300 auxiliary battery location

[@GAVINHR]

Either in the boot or the resistor will be behind the passenger dash

[@jurassiccoast]

You don't understand some things, it's good that you bought an AGM battery but Haldfords is poor quality, always buy the original one, just replacing the battery is half the battle, ou have a start/stop button in your car - you MUST code the new battery otherwise the new one will wear out faster, there are videos on jutube on this subject

[@GAVINHR]

You must code the new battery eh? Thanks for that delightful insight. However I would value a main dealerships practice and advice over a KZbin video. If you watched the full video I told you main dealers do not code batteries. Oh Halfords are poor quality are they? Maybe yuasa will be upset at you hearing that since they make them. That's funny as the 'original' battery didn't last 4 years. The poor quality battery as you call it comes with a 5 year warranty. Makes sense really doesn't it. Maybe since you understand so much more than I do why are you even watching my video rather than sorting it yourself with your deep knowledge?

[@K.Sherell]

I replaced my battery but it didn’t fix my stop/start problem 😢

[@klptldn]

start -stop syst. is a battery killer....very understandable offcourse. I do not like it , so i disconnected the little little extra wire ,now the car "thinks" the battery is weak and deactivates the start-stop system automaticly.

[@nenenyarko]

I should have watched your video before going to halfords for them to charge me £50. Ouch.

[@GAVINHR]

Robbing buggers! I trust it's all working now ?

[@nenenyarko]

@@GAVINHR sure. Worked just as you said.

[@luispereiratocadordotelhad6694]

Did you lost all your settings?

[@GAVINHR]

Nope all good

[@luispereiratocadordotelhad6694]

@@GAVINHR thank you o just bought mine the same as you Halfords doing it later I was going to put jump leads from another car to not loose the settings. Mine is a 2019 220d should be fine then . Thanks for the video

[@GAVINHR]

@luispereiratocadordotelhad6694 you’re very welcome !

[@Harsasingh8796]

Can anyone tell me the price of the battery

[@pgachapman]

Halfords 115 Agm batteries are currently priced at £202 as of end of jan 23. Hope this helps

[@jurassiccoast]

Never buy replacements battery, always buy the original, you earn enough to afford an original battery, you don't drive a Corsa, you drive a Mercedes, FF sake. If cars has a start/stop button you ALWAYS have to adapt a new battery, you're English and you don't understand this so always adapt a new battery with the OBD2 interface, just do it, also you have to "learn" the windows closing because it doesn't work because of the battery replacement. The UK Mercedes service stations are mostly staffed by ordinary local people who don't know much about technical matters and are replaced by immigrants from the EU who have knowledge and experience in technical matters, as in my case when I go to a Mercedes service station I tell them what to do with my car and it is recorded on video so later that I can see what has been done. I only go to a Mercedes service centre to have all my service history or any replacements documented so that they are done at a Mercedes and not in some garage next door. Don't mislead people into thinking that changing a battery is so easy, new cars are not old cars without on-board computers where you could change the battery like in this video 🤨

[@mb-sc3el]

Good video mate. Dont buy these halfords batteries, specially for mercs take my word for it they are terrible

[@GAVINHR]

I figured... It's £140 quid, it comes with a 5 year guarantee and I won't have the car 5 years! Plus I've always heard decent things of them? After all, Halfords batteries are yuasa!

[@mb-sc3el]

@@GAVINHR i have the same c220 in silver always use varta on mine my brother put one of those in his clk220 it only lasted a year before it stopped holding charge. İ also done the auxiallary battery gave me problems last year all of them have this issue

[@MonsurRa]

People that have an alarm fitted make sure you disable or put it on valet mode before you change the battery.

[@ricardomarkdac]

In this video kzbin.info/www/bejne/pYKumYxpq76snpY they confirm there is no need to code or tell the car that the battery has been replaced. So this video is accurate !!!

[@Jim.Thunda]

My brake sensors are kaput. And l dont care, ABS is only for people that never learned to drive properly. I raced for years without it no problems. You dont need all that electronic crap or those sensors that Benz dealers like to pack your tucker chute for you. Cars made in thr 60's and 70's are still the best, this is why they are sky rocketing in price, any fool can work on them. And they don't t need a mechanic with a scan tool😅

[@ridvanismail2428]

Shit reklamen

[@ahmetgokmen4181]

Wrong wrong wrong DO NOT DO THIS you must keep engine runs otherwise vehicle memory losses.

[@GAVINHR]

Not true. Plus how on earth do you keep an engine running whilst removing a battery?

[@ahmetgokmen4181]

@@GAVINHR mate I did exactly what you show and it's cost me a lot of money to fix it.it was very stupid decision

[@GAVINHR]

64,000 people have viewed this and nobody has reported an issue

[@ahmetgokmen4181]

Sure??? you better talk with Merc mechanic you will found out.

[@GAVINHR]

@@ahmetgokmen4181 i did... thats why i advised the battery does not need coding