S-Class W222 New Battery Registration
- Thread starter Tahushi
- Start date
I do not think you need to do that.
Just replaced my S205 battery and nothing needed coding or resetting. If you swap like for like just follow this procedure:
important: you need rubber gloves,eye protection and suitable old clothing as battery acid is very harmful. If you get splashes rinse with plenty of water. Get medical assistance if it goes in your eyes.
* Open car release bonnet
* lock car leaving bonnet unlatched and leave it for at least 30 mins so all systems go to sleep
* leave keys in house or well away from car if you have Keyless go
* open bonnet and access battery
* remove negative lead from battery and place it out of the way
* remove positive lead and place it out of the way
* remove battery retaining clamp
* remove plastic overflow pipe if fitted
* remove battery
* sweep battery tray if required
* place new battery into the tray and clamp in place
* connect the plastic pipe to the new battery. You will need to remove the bung from the breather hole to do this.
* very important- connect the positive wire to the battery positive post
* connect the negative lead.
* check all secure then replace any trim and covers
* collect keys, open car and start up.
Should now work as normal. If windows or sun roof needs re setting simply fully open and hold the button in full open for 3 seconds then close and hold button. Repeat for all windows. If steering message, with engine running, turn steering onto full lock and hold for 5 seconds then turn completely to the opposite lock and wait, repeat once more then return wheels to straight ahead position.
Store old battery with terminals covered and away from children and pets. Dispose of battery at Council tip.
important: you need rubber gloves,eye protection and suitable old clothing as battery acid is very harmful. If you get splashes rinse with plenty of water. Get medical assistance if it goes in your eyes.
* Open car release bonnet
* lock car leaving bonnet unlatched and leave it for at least 30 mins so all systems go to sleep
* leave keys in house or well away from car if you have Keyless go
* open bonnet and access battery
* remove negative lead from battery and place it out of the way
* remove positive lead and place it out of the way
* remove battery retaining clamp
* remove plastic overflow pipe if fitted
* remove battery
* sweep battery tray if required
* place new battery into the tray and clamp in place
* connect the plastic pipe to the new battery. You will need to remove the bung from the breather hole to do this.
* very important- connect the positive wire to the battery positive post
* connect the negative lead.
* check all secure then replace any trim and covers
* collect keys, open car and start up.
Should now work as normal. If windows or sun roof needs re setting simply fully open and hold the button in full open for 3 seconds then close and hold button. Repeat for all windows. If steering message, with engine running, turn steering onto full lock and hold for 5 seconds then turn completely to the opposite lock and wait, repeat once more then return wheels to straight ahead position.
Store old battery with terminals covered and away from children and pets. Dispose of battery at Council tip.
OP
OP
Tahushi
New Member
Thank you for the detailed reply. Does your car have a sensor attached to the negative terminal as mine (see picture). Someone said that if there is such a sensor attached 
,programming may be required
,programming may be required
It has a sensor. I believe that the key is letting the car go to sleep. It wakes up with the new battery and so far one week on all seems fine.
I changed for a like for like Varta battery purchased on line.the new one is a silver grey plastic case but all else is the same.
I needed to carefully poke an opening for the breather pipe at the positive end of the battery before fitting.
I changed for a like for like Varta battery purchased on line.the new one is a silver grey plastic case but all else is the same.
I needed to carefully poke an opening for the breather pipe at the positive end of the battery before fitting.
Ted
MB Enthusiast
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That is an ‘intelligent’ battery sensor.
it measures state of charge, state of health, and temperature, andis used to manage intelligent charging and stop/start.
if you are replacing like for like, you shouldn’t need to register the battery. If you are putting in an uprated battery you should register ot so you get the full benefit.
it measures state of charge, state of health, and temperature, andis used to manage intelligent charging and stop/start.
if you are replacing like for like, you shouldn’t need to register the battery. If you are putting in an uprated battery you should register ot so you get the full benefit.
wongl
MB Enthusiast
There is a cap you can remove so that you can insert the breather pipe.
There is a cap on the factory battery. On the photos earlier in this thread you can see the red blanking cap on the negative end of the battery. The plastic breather pushes in to the battery in the same position at the positive end of the battery. On the Varta replacement I purchased both ends of the battery had the recess for the breather but both had the ends sealed. I very carefully poked a small hole in the end of the recess that the pipe goes into. Without this gas would not be able to escape. I urge great care to just make the opening and not to ram say a screwdriver in at force to remove the plastic at the end of the recess channel. Seems odd that the battery did not come with removable bings like the factory battery.
wongl
MB Enthusiast
Curious to where you purchased your Varta from? I recent purchased two Varta batteries (on separate occasions) and both had removable caps (on both ends). I cannot imagine a reputable company such as Varta shipping a battery without vents! This goes against all the advice to ensure the battery is vented before charging and fitting to the car!
Purchased online from Tanya Batteries. Process was smooth, good price and next day delivery. Their feedback was good so no concerns.
To avoid putting a lead out to the car to charge the battery fully I charged the battery on my work bench. I was aware of the need to vent the battery when and in use. Prior to charging I noticed that the battery had no removable plugs in the vent holes but a recess moulded into a large round insert on each side which was sealed at the end. The inserts are welded to the plastic of the side case and cannot be removed. I assumed that when the breather pipe is tapped into place the hard end of the pipe will rupture the end wall of the recess and slow the breather to work. As I wanted to bench charge the battery I very carefully pierced the end of the recess that would later take the breather pipe.
I am not sure if the battery that I received had missed final QC and had missed the opening of the breathers and their plugging with a blank prior to dispatch or it is the intention that the breather pipe is pressed home to rupture the sealed end of the recess. None of the attached fitting documentation mentioned checking that the breather hole was open. I will contact the vendor next week as there is a real danger if a battery cannot vent when charging.
To avoid putting a lead out to the car to charge the battery fully I charged the battery on my work bench. I was aware of the need to vent the battery when and in use. Prior to charging I noticed that the battery had no removable plugs in the vent holes but a recess moulded into a large round insert on each side which was sealed at the end. The inserts are welded to the plastic of the side case and cannot be removed. I assumed that when the breather pipe is tapped into place the hard end of the pipe will rupture the end wall of the recess and slow the breather to work. As I wanted to bench charge the battery I very carefully pierced the end of the recess that would later take the breather pipe.
I am not sure if the battery that I received had missed final QC and had missed the opening of the breathers and their plugging with a blank prior to dispatch or it is the intention that the breather pipe is pressed home to rupture the sealed end of the recess. None of the attached fitting documentation mentioned checking that the breather hole was open. I will contact the vendor next week as there is a real danger if a battery cannot vent when charging.
That would be me with the name. At least you spotted my error.
I had an email back today from Tayna today saying that the battery is AGM and does not need venting.
the fitting instruction booklet attached to the battery does say refit the plastic elbow and breather pipe when installing. I am happy that my battery will vent and is safe. All a little odd.
OP
OP
Tahushi
New Member
I am not too sure about Tayna reply. AMG batteries also need venting. My S-Class battery is an AMG but has vents on both sides and it has a tube attached to one of them.
Attachments
I also believe that AMG batteries need a vent Tahushi. I did make sure that the new battery has a hole to vent via the breather tube. Could be the battery people did not understand my email. A little concerning that some people will fit batteries that are not vented with the inherent risk of pressure build up and the battery rupturing.
Diesel Benz
MB Enthusiast
Would be interesting to know the reason for a new main battery? Are you sure your problem is not the stop/start battery?
What is the MY of this car?
AMG/VLRA batteries do not need the old-fashioned breather but they often have an emergency breather. It is supposed to stay closed through out the life of the battery but opens if the battery "explodes" when failing badly for any reason.
Hi, in my case the battery was 4.5 years old and would not give a resting reading of over 12.3 even after a full charge with my CTEK MXS 5. A battery critical message would show on the dash and the Mercedes me app if I did not use the car after about 5 days. Prior to the lockdown even after a 280 mile run the Stop Start light would not go green.
Having replaced the battery no more warnings and the Stop Start function has worked every time even after 5 or 6 starts on a very short trip to the supermarket and back. Resting voltage after several days has always read above 12.6V. I am happy that the main battery was my problem and not the secondary capacitor or a parasitic leakage.
