05-26-2020, 12:17 PM | #23 |
New Member
2
Rep 8
Posts
Drives: 2020 M340i & 2019 XC90 R
Join Date: May 2020
Location: Ottawa, Canada
|
Here is what I can find on the Battery.
"The Power Control Unit (PCU) is mainly installed to avoid or reduce the energetic load of the vehicle battery during automatic engine stop (MSA). The reduction in the cyclisation (= number of cycles of the automatic engine start-stop function) extends the service life of the vehicle battery. The preconditions for adjusting the energy management are derived from the usage of the vehicle. When the engine is running, the auxiliary battery is loaded from the vehicle electrical system basic version. During the phases with automatic engine start-stop function stop, the energy from the auxiliary battery is fed back into the vehicle electrical system basic version" "The auxiliary battery is an AGM battery. On vehicles with dual storage system, the auxiliary battery is a lithium-ion battery." I think they mean the main battery is AGM in the trunk and the front battery is Lithium-ion. https://www.newtis.info/tisv2/a/en/g...ery/1VnYtww1lT |
10-11-2020, 09:11 AM | #24 |
Private
17
Rep 92
Posts
Drives: 2007 BMW 335xi
Join Date: Jun 2015
Location: Elkins Park, PA
|
The 2021 BMW M340s now have an eBoost 48V mild hybrid system which allows for seamless auto start stop (ASS override button removed as well). The engine can shut off even before you fully stop the vehicle amongst other features. Anyone know if the 2020 cars with the 48V battery have these new features as well?
|
Appreciate
0
|
10-11-2020, 02:37 PM | #25 | |
General
13241
Rep 19,734
Posts |
Quote:
|
|
Appreciate
0
|
04-09-2021, 07:34 AM | #26 |
Captain
539
Rep 853
Posts
Drives: 2020 BMW M340i xDrive
Join Date: May 2019
Location: Up-Upstate NY
|
I have 2020 M340i with the dual battery system. So if we wanted to disconnect the battery before working on any electronic stuff, we'd have to do both to fully unplug the vehicle?
|
Appreciate
0
|
09-05-2021, 09:34 PM | #27 |
Registered
0
Rep 1
Posts |
|
Appreciate
0
|
10-22-2022, 07:09 PM | #29 |
General
13241
Rep 19,734
Posts |
It has both but you are first charging the AGM using the terminals under the hood so use that setting. Assuming you have a mild-hybrid, make sure you keep the hood open when charging.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2024.40
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50 |
Appreciate
1
nealjay9.00 |
10-22-2022, 07:55 PM | #30 |
Private
36
Rep 80
Posts |
I’m using a CTEK MXS 5 to charge the AGM starter battery in my 2023 440i convertible. The BMW manual states that the hood must be open to charge the starter battery. I keep it ajar after connecting to the dummy terminals in the engine bay. Car is locked. Charger is working fine. I don’t think the 48v lithium ion battery can be charged using a CTEK charger. The manual doesn’t say that the 48v battery requires charging,
|
Appreciate
0
|
10-22-2022, 08:11 PM | #31 | |
General
13241
Rep 19,734
Posts |
Quote:
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2024.40
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50 |
|
Appreciate
0
|
10-22-2022, 08:32 PM | #32 |
Private
36
Rep 80
Posts |
I didn’t know that. Self discharge rates of Li ion batteries are very low. So I assume over a few months of storage, the hybrid battery will not need to be charged. I have a Volvo PHEV with a 19 kwh battery and the discharge rate over weeks is negligible. Regarding the CTEK, it charges at max current until the starter battery is at 80% and then charges at declining current to full charge. The battery is then topped off as needed to compensate for self discharge of the AGM battery.
|
Appreciate
0
|
10-22-2022, 08:59 PM | #33 | |
General
13241
Rep 19,734
Posts |
Quote:
48 V battery may become totally discharged, and possible replacement needed if: a) The vehicle has been charged using a 12 V charger with the hood closed during a long stationary period, the. For example, the showroom or storage. b) Vehicles stored for an extended period connected to a low output solar or trickle charger. c) Vehicles stored for an extended period with no charger connected and not properly maintained 12 V battery. https://static.nhtsa.gov/odi/tsbs/20...88948-9999.pdf
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2024.40
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50 |
|
Appreciate
0
|
10-22-2022, 09:04 PM | #34 | |
Lieutenant Colonel
750
Rep 1,773
Posts |
Quote:
|
|
Appreciate
0
|
10-22-2022, 09:16 PM | #35 | |
Private
36
Rep 80
Posts |
Quote:
:Trickle chargers (< 20-amp output) or solar chargers will not be able to charge the 48 V battery, but could prevent further discharge to the 48 V battery when the 12 V battery is properly maintained to optimal SOC.” CTEK trickle chargers will not able be charge the hybrid battery. Li ion batteries discharge very slowly and at a lower rates when not fully charged. My Volvo manual states that the hybrid battery should be stored at less than 25% charge for longevity. I wouldn’t worry about discharge of the hybrid battery as long as there is a trickle charger attached to charge the starter battery. A few months of storage should not kill the hybrid battery in my judgment. https://batteryuniversity.com/articl...f-discharge-do Last edited by anandn; 10-22-2022 at 09:34 PM.. |
|
Appreciate
1
ultrared93103.00 |
10-23-2022, 08:42 PM | #36 |
Private
9
Rep 57
Posts |
|
Appreciate
0
|
10-23-2022, 08:47 PM | #37 |
General
13241
Rep 19,734
Posts |
Some folks were able to get it charged after having it hooked up for two or three days, hopefully you will be successful.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2024.40
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50 |
Appreciate
0
|
10-23-2022, 09:22 PM | #38 |
Private
36
Rep 80
Posts |
Should be much faster than that. Using the CTEK MXS 5, a 90 Ah BMW AGM discharged battery should be charged within 24h. Mine went to 80% in less than 20h and to the floating charge setting within 24h. My 2023 440i sat at the dealer for six weeks because I wasn’t in town to take delivery and the battery was severely discharged. Only thing to keep in mind is that CTEK chargers (which is also what BMW sells with the BMW logo) get pretty hot when it charges at max amperage in the bulk charging phase and should be kept on on a cool surface. Not covered or stuck in a corner without adequate air flow. The charger doesn’t have an in built fan to dissipate heat.
Last edited by anandn; 10-23-2022 at 09:30 PM.. |
Appreciate
0
|
10-23-2022, 09:52 PM | #39 | |
General
13241
Rep 19,734
Posts |
Quote:
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2024.40
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50 |
|
Appreciate
0
|
10-23-2022, 11:19 PM | #40 | |
Major General
1507
Rep 5,089
Posts |
Quote:
I have done 2-3 charges overnight so far(took delivery 4/2021) without issues. |
|
Appreciate
0
|
10-24-2022, 06:53 AM | #41 | |
Private
36
Rep 80
Posts |
Quote:
Last edited by anandn; 10-24-2022 at 06:58 AM.. |
|
Appreciate
0
|
10-24-2022, 08:48 AM | #42 |
General
13241
Rep 19,734
Posts |
It is not confined to a CTEK as I used a Schumacher. Actually I don't think it is the charger at all but rather the vehicle never shutting down and the battery/charge being used. Mine was constantly making noises and the charging progress was going very slowly. I then switched it from maintainer to a 30amp quick charge and the battery SOC rose much more rapidly.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2024.40
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50 |
Appreciate
0
|
10-24-2022, 11:41 AM | #43 | |
Private
36
Rep 80
Posts |
Quote:
|
|
Appreciate
0
|
10-24-2022, 12:03 PM | #44 |
Major General
1507
Rep 5,089
Posts |
I think I did lock and then unlock the car to turn off all electronics, then charge through under hood jump terminals with hood opened. I will try this again this week and report back.
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|