06-15-2022, 08:33 AM | #1 |
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Battery charging
I noticed there is a huge difference when charging the battery in my M550i...If the car is not locked, it takes at least 12 hours to get to full charge. If I lock it, it fully charges in about 2 hours. Hood is up in both conditions. Using Ctek mxs 5.0 in AGM mode. Everything appears to be off in the car when it's unlocked, but there must be something still running. I always lock it now, even when in the garage.
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06-15-2022, 11:06 AM | #2 |
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I have a short 3-mile commute and don’t drive much during the work week. I use a Battery Tender charger/maintainer every night to keep the battery at an optimum level. I do notice a wide variation in full charge times. The battery is usually at full charge by time I leave for work the next day, but sometimes it does reach full charge. I leave the hood open but will experiment with it closed. BMWs seem to never completely shut down.
I had a bad experience with my 2012 535i. At around 10k miles, my battery completely died, left me stranded and the car had to be towed to the dealer. They told me I wasn’t driving the car enough to charge the battery and wanted around $800 to replace it. I told them I would not pay for it, and they did a courtesy replacement. This was apparently an issue many others were experiencing at the time, including the dealer showroom cars. Ever since, I have used a Battery Tender almost daily and had not had any issues. One thing I am not sure about is if there is more than one battery. In my previous two Jaguars and Range Rover, they had a main battery in the trunk and a separate battery for the start/stop system. JLR recommended charging by hardwiring the charger cable to the bus panel in the trunk to charge both batteries. These vehicles would enter a sleep mode if the car was not used for a period of time. You could actually enter a wake-up time if your car was going to be sitting at an airport for an extended period of time.
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06-15-2022, 11:17 AM | #3 | |
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Has your car fully drained on you ?
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Last edited by HerkHealer; 06-15-2022 at 11:24 AM.. |
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06-15-2022, 04:28 PM | #4 |
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Herk - My battery never completely drained because I always lock it. I wasn't locking it when I was charging it and that's when I noticed something was running. There are days where the car won't move and some weeks I don't drive it much. There's always a reason why I'd rather take the Lexus because of a bad parking situation...which seems to be everywhere. I'll do an overnight trickle charge at least once a week.
Jcal - I've heard that too about hardwiring to the battery in the trunk. There are two batteries in my car. The manual suggests using the posts in the engine bay to charge the batteries. The front charge seems to be working, but now I'll test the battery in the trunk. |
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06-15-2022, 06:48 PM | #5 | |
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I have a copy of the workshop service manual for the G30. It has some interesting information regarding the battery. One thing I am going to check is that my Battery Tender maintains a constant charging voltage of 14.8 V.
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06-15-2022, 07:05 PM | #6 | |
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. Last edited by 2022M550i; 06-15-2022 at 07:16 PM.. |
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06-15-2022, 07:09 PM | #7 | |
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06-15-2022, 07:51 PM | #8 |
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A few questions: Do you confirm the system shuts down before leaving the vehicle unlocked? For example, if I don't see the screen turn off, I hold the radio power button for a few seconds to make sure it does.
Also, is there a way to see the battery level, via bimmercode or otherwise? I would think locking and essentially arming the alarm would use more power than leaving it unlocked. |
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06-15-2022, 08:15 PM | #9 | |
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I have a good battery tester that I can check out whats going on….just haven't had time to dig into it yet. Maybe when you lock it, it goes into some sort of hibernation mode where unlocked, it something stays alert. I assumed the same that you did…regarding unlocked, it would use more juice. |
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06-16-2022, 06:44 AM | #10 | |
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Lock it and it goes into sleep mode. I charge mine while locked, definitely faster top up times using my CTEK MXS 5.0 |
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06-16-2022, 07:37 AM | #11 | |
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06-16-2022, 12:38 PM | #12 | |
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If you want to check the car’s battery level and pull/clear/reset codes…it’s their “sister app” BIMMERLINK that allows you to get diagnostic help and check the battery level as well as do a new battery registration as well as other service resets etc. Just as Bimmercode has a website…Bimmerlink has a website, too that goes into detail about the app. Here’s screenshots of of the battery state of charge you can retrieve from the Bimmerlink app…as well as some other info you can retrieve:
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06-17-2022, 11:16 AM | #13 | ||
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Was asking if there is a way to code the indicator to appear on the car's screen. |
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06-18-2022, 11:35 AM | #14 |
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this is the charger that i use in my bay. your trickle charger is cute. this will sustain car when on and when it is pulling 40 amps. your trickle charger wont do that. and when your battery is charged the amperage will drop automatically protecting your vehicle and battery.
https://www.deutronic.com/produkte/d...-computer-1ac/ |
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06-18-2022, 11:39 AM | #15 | |
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08-27-2022, 12:42 AM | #17 | |
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08-27-2022, 12:54 AM | #18 |
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https://g30.bimmerpost.com/forums/sh....php?t=1760197
I've been using the CTEK charger for maybe a year now with no issues. I installed the panel in the trunk as described in this thread. |
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08-27-2022, 09:51 AM | #19 | |
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08-27-2022, 09:27 PM | #20 | |
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04-25-2024, 10:08 AM | #21 | |
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04-25-2024, 12:12 PM | #22 |
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I posted information on battery charging and a method for safely charging both batteries at the same time.
https://g30.bimmerpost.com/forums/sh...php?p=31087669 |
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