03-01-2022, 10:04 AM | #1 |
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2nd battery
I have a 2021 330i xDrive. I noticed there appears to be a second battery in the engine compartment on the right side near the windshield. Inasmuch as the car is not an 330e nor an M model with mild hybrid, what is the second battery for?
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03-01-2022, 10:14 AM | #2 | |
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I could be wrong obviously, but sounds like it was fitted with the 330e battery? lol. I think in the none E's that spot is just empty. Have a picture? |
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03-01-2022, 02:27 PM | #3 |
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Can you read the label? I suspect it is a 12V Li-Ion battery. My understanding is that these are better at cycling charge in order to save fuel and not cycling the starter lead battery as much.
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03-05-2022, 03:13 PM | #5 |
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my car is a mild hybrid and does not have this battery. the space is empty, very tempted to put a bag of fruits/potatoes in there when i visit the grocer
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03-05-2022, 07:16 PM | #6 |
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I thought "Imgee" found the secondary 12V Li-Ion battery in the same location instead of the MHEV-battery. My MHEV M440i has a 44V Li-Ion (440Wh) in the indicated location (in section Mild Hybrid page 371 in my owner's manual)
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03-06-2022, 01:00 PM | #8 |
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MHEV models have the 44V Li-Ion battery on the (cars) right side in the engine compartment. It is my understanding that "Imgee" found that the non-MHEV 330i instead has a 12V Li-Ion at the same place instead of a MHEV battery.
If you don't have a 44V Li-Ion battery at this place in your M340i, isn't your car the earlier model (without 48V system)? Do you have a Stop/Start-disable button next to the engine Start-Stop button? |
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03-11-2022, 05:03 PM | #9 |
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my car has the battery charging and discharging on the energy flow section and the dealer says it has mild hybrid, but empty space for my grocery
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03-14-2022, 11:46 AM | #10 |
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Drives: 2020 BMW M340i xDrive
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Location: Up-Upstate NY
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Mine is a 20, and has the second battery. It's a dual supply system, I think primarily to reduce battery wear with the auto start/stop and running vehicle electronics.
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06-28-2024, 01:36 PM | #11 |
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Has anyone found out how much it is to replace this battery? I have a 2020 and it is giving me trouble
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08-05-2024, 03:11 PM | #12 |
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2021 330i xdrive us spec. I am not sure if I have to register the auxiliary battery too. I don’t think I do because I don’t see IBS. Check out the image does it have IBS? Do I need to register this battery too?
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08-08-2024, 08:58 AM | #13 | |
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Yes, the dual storage 12V battery has to be registered when replaced (ISTA+ Path: 03 body > voltage supply > dual store system registration). Larry
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08-09-2024, 12:28 PM | #14 | |
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08-10-2024, 06:40 AM | #15 | |
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i do not know.
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10-01-2024, 01:50 PM | #16 |
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secondary battery Li ion 2020 330i
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10-01-2024, 01:59 PM | #17 |
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Damn for a tiny battery like that. I took a risk and decided to replace my starter and thankfully that fixed my issue. As for li-ion battery I called a shop and he had someone who was able to repair lithium ion batteries if they had a bad cell. Don’t think I’d take that risk though.
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