11-28-2020, 10:26 PM | #23 |
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Continued learning on Mild Hybrid system
Thanks "TheNew3" for your input.
I'm still at the "not so sure I know what's going on" stage after talking to BMW tech and doing some reading on Li Ion battery technology. BMW tech showed me the CTEK designed BMW charger that they use on showroom cars - it has lead acid and separate LiFePO4 charge profiles that are quite different in terms of voltage, bulk and saturation charge times/current levels, etc. They advise that they keep showroom cars on the charger on the LiFePO4 profile. So based on that, I bought their charger and put it on the X7 in LiFePO4 mode. I could not find a comparable CTEK charger that had both Lead Acid and LeFePO4 profiles ... so I'm presuming that there's enough going on here in our BMW mild hybrid system that using old CTEK MUS4.3 might be like playing with fire. I let new charger "cook" for 12 hours and found a "power management" error message on the check control toward the end of that time. And as the charging progressed I noticed repeated relay action under the hood and in the vicinity of the LiFePO4 battery tucked up under the hood on the passenger/firewall side. Also monitored voltages on the jump start terminals and found that they didn't show predictable voltage rise that I expected. After studying Li Ion batteries tonight on the BatteryUniversity.Com site I now recognize that what's normal and good on a Lead Acid or AGM battery is not necessarily good on a Li Ion battery. (e.g. ... They don't want/like to be kept at full charge; any overcharging is death; charge rates are very critical.). So I have a note back into my BMW tech to ask for guidance regarding the 'power management' message and the clicking relays. If we have any battery / 48V mild hybrid gurus on this forum, we could really use a crash course on the BMW system. I've searched for Tech Guides on the system and none appear to be posted/available. All input/thoughts welcome. As I learn more from my techs, I'll post accordingly. |
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11-27-2021, 11:45 PM | #24 |
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I will be leaving the country for several weeks and the only car I have that does not have a trickle charger is the X7. To make sure the battery does not go flat, should I have it connected to the battery in the trunk or the Lithium batter under the hood? Thank you
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11-28-2021, 10:25 AM | #25 | |
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11-28-2021, 01:54 PM | #26 |
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Thank you!
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03-26-2023, 08:03 PM | #27 |
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I’m new to my 2023 X7 as well and perusing this communities threads a lot, came across this albeit old thread. I’m using a CTEK charger as well in AGM mode but I basically spent the time to hook a CTEK quick connect outlet to the trunk battery directly. So when I want to charge I just plug it directly from the trunk. Has anyone done that? Is that not advisable or worst yet would that impact warranty?
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03-26-2023, 08:30 PM | #28 | |
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03-27-2023, 08:21 AM | #30 |
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Although BMW Brunei but when researching CTEK comfort connect and BMW came across this link, looks like BMW themselves sell the comfort connector which looks exactly the same as the CTEK connector as others have pointed they may be the OEM manufacturer.
https://www.bmw.com.bn/en/topics/off...or-eyelet.html |
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03-27-2023, 09:54 AM | #31 | |
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Also, do not use the 12v (cig lighter) sockets to charge the battery either.
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03-27-2023, 10:18 AM | #32 | |
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05-04-2023, 01:29 PM | #33 |
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If I disconnect the main terminal cable, will that help preserve the battery as I'm going to park the car for a month. There is no power outlet in our community garage so cannot use a wall charger.
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05-04-2023, 01:47 PM | #34 | |
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If you can park outdoors under the sun, you can get a solar battery tender like the one listed below. https://www.amazon.com/Upgraded-Wate...2s9dHJ1ZQ&th=1 Last edited by thenew3; 05-05-2023 at 02:23 PM.. |
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05-08-2023, 10:43 PM | #35 |
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For the vehicles with the 48v battery, theres a tis bulletin that says the 48v battery is not charged if a charger smaller than 20a is connected and/or the hood is closed.
https://www.google.com/url?sa=t&sour...B9X3pd2k0Htg1O |
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05-09-2023, 11:34 AM | #36 | |
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"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." Which suggest that if you keep the 12V battery charged, the 48v should not discharge. So if that's the case, a solar or trickle charger on the 12V system should keep the 12V "maintained to optimal SOC" at which point the 48v should not discharge. |
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04-03-2024, 10:48 PM | #37 |
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I just ordered a 2025 X7 40i, my first BMW. This will be a second vehicle used mostly weekends and special occasions, so will commonly sit several days at a time. Coming from Lincoln Navigator, I know the heavy electronics can drain the battery when not driven for several days. Experience has taught me the importance of using a battery maintainer. With the Lincoln I just wired it directly to the battery. I understand from this thread that I need to utilize the “jump start” posts under the hood. Have also seen on another thread that hood must be closed and vehicle locked for battery maintainer to perform properly. Can anyone confirm or disprove this, or have any other advise to insure success?
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04-04-2024, 12:43 AM | #38 | |
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04-04-2024, 09:09 AM | #39 |
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Thanks! That part didn’t sound right to me! Makes sense to leave the hood open. Appreciate the advice. Can anyone confirm the part about the vehicle needing to be locked?
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04-04-2024, 09:38 AM | #40 |
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locking the vehicle lets it enter sleep mode sooner. you can charge with the doors unlocked, but when the car is awake theres a fairly large draw on the battery.
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04-29-2024, 04:24 PM | #42 | |
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