01-10-2024, 02:57 PM | #1 |
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2021 40i Battery life
Featured on BIMMERPOST.com After 8 month overseas it was time for me to get back and try to restart my 2021 40i. While I had little hope it would start on its own I didn’t think it wouldn’t even let me in. Had to use the physical key to get in and then surprise nothing… idrive wouldn’t even start Tried to jumpstart it with a NOCO booster, didn’t work After contacting roadside assistance and had a truck try to jump start it (he tried with two batteries), it turns out the battery is just completely dead and needs replacement. Considering both our F48 and F11 never had any issue restarting sometimes even after a year without driving is the battery life on the G05 this low? I don’t know much about micro hybridation but I thought 48V might increase the battery life? I recently just changed my F11 original battery who was 12 yo… |
01-10-2024, 03:13 PM | #2 |
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8mo connected without a tender? I'm surprised any standard car battery could survive that.
Either way, car batteries are good for 5-10yr depending on use and climate. You're a bit early, but use case doesn't seem kind to them either. I'd just replace. |
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01-10-2024, 03:25 PM | #3 | |
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It’ll probably be replaced, still waiting for the dealership to reach out |
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01-10-2024, 03:45 PM | #4 | |
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01-10-2024, 04:44 PM | #5 |
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One of the SIBs indicated that the 48vdc battery won't be charged unless the applied voltage/current exceeds 20A, which is over what most battery tenders can product (most are in the 4-10A range).
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01-10-2024, 04:52 PM | #6 |
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It doesn't remove it from the charging circuit but rather deactivates it from being able to supply power. As mentioned above, if the charger is powerful enough the 48v will be charged with the hood open.
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01-10-2024, 06:49 PM | #7 | ||
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a) The 48 V battery does NOT charge when using a 12 V battery charger with the hood closed. When charging the vehicle using a 12 V battery charger, the 48 V battery is ONLY able to charge with the hood open. b) Trickle chargers and solar chargers may not be able to properly maintain the 48V battery to jad03060s point c) Prolonged used of the “Emergency charging function” causes the 48 V battery to become totally discharged. This occurs when the 12 V battery is not properly maintained and the SOC of the 12 V battery drops below the critical threshold value while the vehicle is in sleep mode. The vehicle is woken up and recharged from the 48 V battery. If the 12 V battery is not properly maintained, this cycle repeats until both batteries become totally discharged. JA-06, I stand corrected and the important point is even with the hood open, the battery charger needs to be able to supply at least a 20a in order to start charging the 48V battery (which are quite pricy by the way) |
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01-10-2024, 06:59 PM | #8 |
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No need to stand, we are informal here.
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01-10-2024, 07:38 PM | #9 | |
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I’ll know more tomorrow about what is actually going on but dealer said it wasn’t just a dead battery, they can read the key but it gives them no information at all about the car not even mileage so something else is messing up this car. Guess I need to switch to a 50e😏 so I just have to plug it while gone |
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01-10-2024, 07:51 PM | #10 | |
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01-11-2024, 03:09 PM | #12 |
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Dealer called me back he is trying to replace the battery but said they are on back order and should only arrive in a month or 2 (said he ordered them in August). His solution is to install an aftermarket somewhat similar battery… gonna have to accept since I’m not really ready to live without a car this long but damn how can BMW make so few batteries?
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01-11-2024, 04:01 PM | #14 |
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So, from what I gather here, is there any reason why we want to keep the hood opened when we are using a battery maintainer like the CTEK or Noco that are charging at 4.3A? Even if you were to keep the hood opened, the 48v won't be charged as the charger is below 20A. Right?
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01-11-2024, 04:08 PM | #15 | |
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01-11-2024, 04:11 PM | #16 | |
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01-11-2024, 04:35 PM | #17 |
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01-11-2024, 05:09 PM | #18 |
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I can't find the source now but as long as it is unlatched/unlocked it should be fine.
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01-11-2024, 05:22 PM | #19 | |
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My practice since I don't want to forget the charger is connected is to place a pool noodle on top of the radiator cover and lower the hood on that. Hood can't latch and it provides a big visual reminder.
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01-12-2024, 11:00 AM | #20 | |
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So how do we maintain the 48v battery and keep it charged?
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And from other threads, driving it on the highway also doesn't necessarily charge the 48v either? Only stop and go driving will charge it? What's best way to maintain the 48v battery then? And then there is the 3rd battery - the other 12v battery? How do we keep that charged? So confused... (coming from a 2013 GX460 that only has ONE 12v battery LOL) Last edited by MattAu; 01-12-2024 at 11:13 AM.. |
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01-12-2024, 11:26 AM | #21 | |
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What third battery are you referring to?
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01-12-2024, 11:43 AM | #22 | |
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I picked up the car last week and has been playing with it and a couple of days ago, I got a warning on my MyBMW app that says Starter Battery is severely drained! I now got myself a CTEK MXS 5.0 only to read that some of us have AGM but some has Li-ion ones. Unlike the BMW branded CTEK charger, the CTEK branded charger doesn't have a choice for Li-ion. Should I return it? |
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