Yeah, I’ve been getting them too. When it gets too low you get “critical level” notifications in the app and via txt / email depending on how MM is set up :smile:

Like you only doing short trips and dashcam not helping either

 

My post should’ve said stop/start Wasn’t working, used to be the only way you could tell if your battery’s low, now we have an App

 

You should drive at least half an hour straight, preferably in CONFORT and make the car as long as possible with the green bar - CHARGE.
Pick some downhill road ... speed up and take your foot off! Must solve!

 

You should drive at least half an hour straight, preferably in CONFORT and make the car as long as possible with the green bar - CHARGE. Pick some downhill road ... speed up and take your foot off! Must solve!

Don’t be silly it’s a software problem

 

Same here, eco mode and coast down the hills means "Starter battery partly charged".
Even refused to open the windows and roof from portal.

 

I have an A200 sport 68 plate, about a week ago I started to get a message on the dash saying 12 volt battery see user manual, spoken to Mercedes me who advised me to leave the car running for about half an hour, next day happened again and then also had a message saying to stop the vehicle and leave running, did that also, the stop start function was also not working at this point, went to the car on Monday and it would not start, roadside attended and got the car going, I went to the dealership and was told this has happened because apparently I don't drive the car enough, granted I have only done 5000 miles in the car but it is still used every day, roadside said the battery was charging fine and had enough charge in it and he was not sure why the 12v battery sign was appearing on the dash. I'm going to pick the car up later on today but have been told they have charged up the battery for me, I personally don't think that is the issue but will see what happens, has anyone else had anything like this happen?

 

I have an A200 sport 68 plate, about a week ago I started to get a message on the dash saying 12 volt battery see user manual, spoken to Mercedes me who advised me to leave the car running for about half an hour, next day happened again and then also had a message saying to stop the vehicle and leave running, did that also, the stop start function was also not working at this point, went to the car on Monday and it would not start, roadside attended and got the car going, I went to the dealership and was told this has happened because apparently I don't drive the car enough, granted I have only done 5000 miles in the car but it is still used every day, roadside said the battery was charging fine and had enough charge in it and he was not sure why the 12v battery sign was appearing on the dash. I'm going to pick the car up later on today but have been told they have charged up the battery for me, I personally don't think that is the issue but will see what happens, has anyone else had anything like this happen?

22 plate a class exactly the same

 

do you have Auxiliary battery in your car? make sure to check on that.

on MBUX, there is section, you can actually look at your battery voltage, when drive you should have 14.7-9 ( new battery ) when park, you should never lower than 11.7-8v,

 

its at the dealership still, they called me to collect it on Monday saying it was fixed, however when I arrived the car wouldn't start, they called me today with an update saying they had charged the battery fully and went to start the car this morning and a warning notice came up saying to stop the vehicle and leave running, they have had it on the diagnostic machine and no fault codes are registering so they are stumped as to what it could be.

 

suggest them to give you a new battery to try,

 

So this morning I get a call from the dealership saying the car was ready to pick up, I asked what had they done, she said charges the battery, I asked anything else and she said no, I explained to her what issues the car was having and she told me that the technician was left a post it note to tell him to charge the battery and send it out, I can not believe how terrible the service is so far, anyway I have told them I will be keeping the loan car they have let me use until they have fixed this issue for as long as it takes and they also need to test everything before I take it back. Worse this is that 3 hours after they called to say I could have it back I get an email from Mercedes me saying the battery level is critical so clearly it’s not fixed. Will see what happens next week. Not happy!!!

 

on my A250, if i park for 4-5 days, if i check on Mercedes me, it will says battery level only partly charged, need to charge the battery. the system takes a lot of power, so i bought a battery charger which i will connect to the car 24h/7 if i'm not drive it. to keep battery for longer life.

 

Surely that must be a fault, you shouldn’t have to charge a battery on a car that’s a year old or less,

 

please keep update with us about your battery

 

Update, so the dealership called again today to say the car was ready, I asked what had they done to it and they said they had replaced the battery, been to pick it up and have driven 9 miles in traffic, everything seems fine now, stop start works ok so hopefully it was just something simple. Will see what happens in the next few days.

 

oh, yes! for that Stop and Go, turn it off. your battery will thank you

 

i got this "Starter battery partly charged" if i park the car for only 5 days. is this normal?

 

I had the same issue, then eventually I was getting a battery critical message every two days. The car sits for two weeks when I am at work. Had to get the wife to turn it over every two days to charge it again. I booked it into Mercedes and they said the battery had a fault and replaced it under warranty. Been fine since then [emoji1696]


Sent from my iPhone using Tapatalk

 

after your replace to a new battery, and park your car for 2 weeks, no issue?

 

As a recent convert to the start/stop system (I initially hated it on all cars) I often wonder if that would affect the starter battery, ie.a battery only has a finite number of charge/discharge cycles & the start/stop system makes heavier use of the starter battery.

I wonder if the people with battery issues on this thread make regular use of the start/stop system. It would be interesting to know.

 

in my A250, i have turned OFF that on and off every time i drive the car. but if i park for 5 days, i will get "Starter battery partly charged". if this message appears only 1-2 days, i will consider it's not normal, but it happen only i park over 5 days. i don't know, should i book a check?

 

New MercedesMe app... just installed and it says “battery partially charged” like some others have commented. This is just since yesterday. Old app has always said “Battery Charged”. Coincidence that battery has depleted to errrr whatever degree “partially” means, just at the same time as I switched apps? ?

 

i'm here in Canada, i didn't have new MercedesMe app so far, and i got the battery changer connected all the time actually, and this morning, after parking for 5.5 days, app says "battery partially charged" i went checked my Ctek changer, and it's showing step 7 ( green, means battery is full ), by the way, we did lost power about 4 days ago, i don't know if that will affect the charger or not. and now i have re-started the charger, see if that "battery partially charged" will turn to full or not

 

“battery partially charged” on my MercedesMe app is NOT correct, i test the battery with voltage meter, its show my battery has 12.85v, and i use Ctek charger that i have tested the battery, shows me green light. the MercedesMe app is wrong!!

 

Im getting same on both apps ‘Battery Partially Charged’. Happened today.

 

a-ho... have you update your MercedesMe app ? get a voltage meter to test the voltage of battery. i tested after about 30min drive, i got 12.4v, but when i connected my charger, the voltage gose to 12.85, which is very good, from now on, i need to keep it connect it. otherwise, battery might become bad after 3-4 years

 

I received the same warning from the new Mercedes app, it said to either charge or go for a drive if at least 30mins.
Due to poor health I hadn’t driven the car for several weeks so assumed it was that but checked with dealer and they said it was due to the car not being driven.
After getting home following a longish drive the App is now showing the battery is fine.

I have never had this issue with my previous Golfs with similar driving patterns as I work from home but will see how it goes.

 

I received the same warning from the new Mercedes app, it said to either charge or go for a drive if at least 30mins.
Due to poor health I hadn’t driven the car for several weeks so assumed it was that but checked with dealer and they said it was due to the car not being driven.
After getting home following a longish drive the App is now showing the battery is fine.

I have never had this issue with my previous Golfs with similar driving patterns as I work from home but will see how it goes.

Mercedes car use a lot of power

 

Permitting the weather I might take her out for a long drive. If not my work commute is approx 25 mins on M1 tomorrow.

 

maybe get a battery charger..maybe

 

Drove it for 5 mins with Start / Stop off. Now showing as charged.

 

Low battery indicators on app also an issue for me with C63s and A35. Bought a charger to top both up as app showing they need it if I don’t do a long drive each forthright. When new, both batteries were only charged to around 25 percent and needed to be charged overnight to get back to full charge. With lots of things using the battery when it is not running, load is running batteríes down much faster than my previous cars. Ok now with the charger, just something else to look out for. Expect to have to charge them after a few weeks of sitting idle, and you won’t get caught out again. First C63s battery was faulty and replaced under warranty as would not hold a charge properly according to the dealership.

 

I made some interesting observations recently. Ever since I've owned my A250 (7 months) the battery gauge has shown 12+ volts when driving but 14+ volts when coasting (this is when the alternator is giving a higher voltage). From what I had read about these new fangle dangle charging systems this seemed to be right. Recently I got the battery voltage critical warning so charged the battery with my CTEK over night, now I have 14.1 to 14.5 volts under normal driving and up to 14.9 volts when coasting so it will be interesting to see what happens when (if) I do a bit of stop/start town driving again.

 

Mine was showing partially charged on the app, just taken it for a 30 minute 14 mile run
The display showed 14.8 up 14.9 coasting.
Now shows charged on app, but I know if I do a 1 mile Tesco run it will be back to Partially Charged, going to have to go the long way round!
I’ve previously left it and other cars at airport car parks for 15 days and never had a battery problem, but I would advise leaving the handbrake off

 

To connect your CTEK leads to the battery was the cover easy to remove? I have noticed there is a positive only smaller cover....not sure why? Thanks

 

I would check the maunal for instructions but I pushed the red cover to one side and connected the red +ve clip and connected the black clip to the brass nut by the wing, I believe that this is the -ve ground point.

 

I asked MB CS a couple of questions the other day and they have just got back to me:

1. How long should an A Class battery stay charged if the car is unused A. Don't know

2. What is the minimum voltage at which the car will start. A Don't know

3. Does the car enter a standby state when its critical voltage is reached A Don't know.

4. If the battery drains in three weeks or less how would you keep it charged at say an airport A. Use a trickle charger.

I pointed out that there is no power at car parks which flummoxed him

The chap apologised that he didn't have the technical knowledge to answer these questions but would pass it to the technical dept but didn't think they would know how long a car could be parked with a fully charged battery, I pointed out that it was a fairly easy calculation, Amp Hours of the battery divided by amps per hour used, not hard really

 

I've left my cars at Heathrow for three weeks or more in the past without problems but as my battery went down to critical in 2.5 weeks I'm trying to get a bit more info out of MB, after all they designed and built the thing so they should be the best people to ask