I hope so, but I dont really understand why the capasity goes down on the 12v battery. Maybe too low charging voltage. Or a safety issue?
Currently my car is undergoing tests to try and solve the issues with the keyless entry & welcome lights.
Part of the testing was on the batteries, the tech guy told me that when you put your car on charge for the Hybrid battery, the BMS on the car will also put some charge into the 12v auxiliary battery and the 12 start/stop battery if it’s required .
So if this is correct there shouldn’t really be any need to self charge the 12v auxiliary battery ?
Personally I think it’s a bit of a complicated system, 3 batteries, 1 BMS, and a tech guy who still hasnt fixed my issues and probably doesn’t know one end of a wrench from the other
This could be the BMS discharging down to the 80% ?
As mentioned, I dont fully understand the system but I was like you I was not understanding why after charging the capacity would drop on my Volvo, I had the battery tested and it was fine, I was always being told by the Volvo dealership and some battery centers who checked it out for me that it was the BMS protecting the system ?
Agree with you, must be complicated and it’s not easy to get correct information from the dealer
I’ve been back and fore my dealership countless times over the last few weeks they’ve now booked a a technician direct from Stellantis, so fingers crossed the issues will finally get sorted.
But as an example of what they know or should I say dont know…
Sales guy told me the DS4 E Tense allows the driver to adjust the intensity of the regen braking by using the paddle shift + & - , no it doesnt, the regen braking is fully automated, the driver has no physical control over it, so that was the first error.
DS technician at the dealership has no clue what so ever how the Welcome Lights & Keyless entry should be working, he’s learnt more about the system from me than I have from him.
The guy didnt even know that we could change gears manually on the car by using the paddle shift when the car has kicked in the engine !!
I really get the impression that they are still learning about the car even though it’s been on the roads for 2 years .
They should do better
Sorry for the late reply here.
So I’ve just checked the 12v battery and heres the figures.
Engine running = 14.85 v
Engine off = 12.45 v under load. (my tester puts load on the battery to test it.)
I then took the car for a spin and tested it again with the engine off it had increased to = 12.86v.
Sounds normal.
Possibly ???
I say possibly because on two occasion when testing with the engine off and the car had been parked for a few hours, the voltage had dropped to around 12.2v, which some would say is almost a dead battery.
I’m going to keep an eye on it, and let the dealership know ready for when the Stellantis tech guy returns in the new year to tackle the keyless entry & welcome lights issues again.
I feel that the car is going into hibernation mode too soon and suspending some features, like the keyless entry & welcome lights, and if this battery is dropping to 12.2v then this could be the reason ?
If the battery drops to 12,2 with no load I think it needs external charging or may be in bad shape.I read a while ago that a DC-DC computer for charging 12 volt bat was Keeping the voltage at 12,2 v, but I would believe the voltage would be higher measuring with no load.
I believe eguipment made for 12volt should work a little bit less than 12v but that is just a thought
I found a page on the internet that may be useful. As far as I know on my car, DS7 crossback e-tense 2020model the front 12v bat is AGM type lead acid
I’ve a sneaky feeling that the 12v auxiliary battery is dropping and is the reason why my keyless entry & welcome lights keeping going into hibernation mode, but the dealership are saying they’ve checked all batteries and they are fine ?
My tester puts the battery under load when testing.
The lowest I’ve seen is 12.2v but also 12.5v ?
This after leaving the car parked up over night and testing in the morning before starting it up.
The Stellantis tech guy has sent is findings to Stellantis in France, they are going to check the car over again in the new year.
Just checked mine.
It’s an EFB battery.
If you slightly pull up the metal bracket on top of the battery you can see the type of battery on the label.
Also checked the voltage again, its holding at 12.4v under load.
I’ve been doing a bit of reading on battery levels, so 12.4v is around 80% charge , most cars , especially newer cars have BMS ( battery management systems), which discharge batteries down to around 80% from full capacity, not exactly sure why it gets a bit techy.
So I’m wondering if this is why I’m seeing 12.4v ?
eagerly awaiting the answer
Like you, I bought a DS7 Etense 2 months ago. My vehicle has 3000 km and I have been stranded on the road twice. When the vehicle is stopped, the engine battery drops to 8 volts and does not start. The problem still persists. I noticed that the accessory battery and the starter battery are connected to the same line. How can one lead acid battery and the other lithium ion work stably? Isn’t it an engineering error? It’s hard to fix unless both are the same type. It is impossible to avoid problems in climate condition?
There is a mismatch between two batteries, resulting in energy loss.
A date was given for the service appointment. I am waiting
This is what happens to the starter battery when the accessory battery is activated after the vehicle is turned off. discharges
Looking at that video I would suggest that the battery is faulty.
When I switch off my engine this battery holds at around 12.5v under load.
With the engine running its around 14.85v.
My understanding told to me by the technician at my dealership is that the battery in the engine bay is the main auxiliary battery , this is used for starting the car and accessories such as keyless entry , welcome lights ect.
The central battery is also 12v, this is sometimes referred to as the stop/start battery, it’s is hidden inside the car under the center consol between the two front seats, this battery supports the main auxiliary battery during stop/start in traffic.
The central “start/stop” battery is NOT used as the main starting battery, it’s job is to support the main front battery…
Again my understanding is that both the auxiliary batteries are Lead Acid type ?
You may have an EFB in the engine bay and central battery, or a mix of EFB & AGM, but both are still lead acid.
I definitely have EFB in the engine bay, not sure about the central battery ?
I was also told , when we charge the hybrid battery, the charging process also checks and puts charge into the two 12v batteries if required.
In your video you are testing the main auxiliary battery.
I’m still having issues with the welcome lights and keyless entry not working each time.
The manual states that these two features will go into hibernation mode if the 12v auxiliary battery is low.
All checks so for on the batteries on my car have come back as ok, but I’m not 100% convinced.
The issues are still being looking at by my dealership, we are waiting for the technician from Stellantis to get back to us.