01-17-2023, 12:00 AM | #1 |
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Mild hybrid battery charging
Anyone else tried to charge up their batteries lately with the mild hybrid? I’ve been doing a lot of coding, rattle-hunting, detailing etc. lately with the doors open and stereo going so I figured I should replenish.
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This is the second time I’ve done this. The first time (right after brining it home), it only pulled 170 watt-hours so it seems I did drain it some. I’ll try to resist messing with this again. |
01-17-2023, 12:35 AM | #2 |
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There's another thread where I posted some stuff trying to figure out some rhyme or reason as to how the 48v battery charges and the best I came away with is that "it does what it does". I really wish I had a better understanding of the system overall. Typically mine sits at around one or two blocks out of the five illuminated. Since I've left the screen activated that shows the drive train I've noticed it's fairly verbose with what's going on.
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01-17-2023, 08:18 AM | #4 |
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My observation, in daily driving, is that the mild hybrid system charges more in sport mode - possibly because they can guise the regenerative braking as aggressive braking/driving?
Otherwise, it stays at 2 bars or 3 bars on the "charge indicator" screen. Last edited by br438; 01-17-2023 at 01:35 PM.. |
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01-17-2023, 08:40 AM | #5 |
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my head hurts trying to figure out whats going on here
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01-17-2023, 09:31 AM | #6 |
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01-17-2023, 10:13 AM | #7 |
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Right but how is any of this related to the hybrid system? And to be honest, with your low mileage, I would just drive the car for like 20 minutes instead lol.
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01-17-2023, 10:18 AM | #8 | |
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https://g20.bimmerpost.com/forums/sh....php?t=1779237 I fully agree my use case was frivolous . But others who are leaving their vehicles dormant for long stretches need to hook up chargers. |
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01-17-2023, 07:29 PM | #9 |
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With the display screen, I've seen the message that it's assisting pop up. I forget the exact syntax, unfortunately. I'll try to pay more attention next time.
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01-17-2023, 08:19 PM | #10 |
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The 48V battery charges whenever you coast (let off the gas pedal while the car is in motion) or apply brakes while the car is in motion.
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01-18-2023, 12:40 AM | #11 |
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To charge the 48v you probably need a bigger charger than just a small trickle charger. The 48v system can charge from the 12v system if it is being charged with a sufficient charger connected and hood open. Although if you’re driving the car normally there’s really no point to externally charger the 48v battery as it is maintained by the system itself. It’s not a PHEV.
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01-18-2023, 07:56 AM | #13 |
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not whenever.... when you initiate braking. For instance, if you are in eco pro, and let off the gas at 70mph on the interstate, the car shuts off the ICE, and freewheels. It does not regenerative brake until you brake. (not a 1 pedal drive).
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01-18-2023, 08:02 AM | #14 |
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My understanding is - the "mild hybrid" system is not like a typical hybrid or electric car where you need to "charge it" ... I am pretty sure you can't just drive in an "electric" mode as you can with a real hybrid.
The BMW system just "supplements" things when needed, or if needed... its helps with start/stop, coasting, a better MPG But I am pretty sure you don't charge the "mild hybrid system" as your car will charge it, or not charge it, as needed. Unlike the car's "regular" battery that all cars have... that you of course can charge with something like a ctek trickle charger. Don't take my word, but this is my understand. I purposely bought a BMW without this "mild hybrid" system. As with everything new, it usually takes a generation of models to work out the kinks. When BMW went turbo, as good as the n54 enginers were, there were problems with HPFP, carbon buildup etc... but look at the turbo engines now and people may say the b58 is one of the BEST on the market. good luck.
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01-20-2023, 01:41 AM | #15 | |
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01-20-2023, 09:04 AM | #16 | |
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I only ask as my car has hardly moved since December 12th due to me breaking my leg, It was driven on the 4th Jan for an hour but that's it. Note: prior to the 4th Jan, there was a low battery warning when I tried to remote start the air con but no warning today when I repeated the remote air con start. Was thinking the 1 hour drive on the 4th had charged everything back up again? |
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01-20-2023, 09:40 AM | #17 | |
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03-23-2024, 06:15 AM | #18 |
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Wanted to bump this thread as I have a question about the 48v battery under the hood for those who have the mild hybrid system.
What is the life span? Nothing wrong with mine for now just trying to do some research before I get to that point. I see that a replacement from BMW is anywhere from 1600 to 2gs. Stock part # 61 21 5A38DE3 ..If it was to be replaced is there coding and register needed like the 12V rear battery? I found antigravity battery to have replacements for around a 1000 depending on which Ah you get. Which amp hr will work 24ah, 40ah or 60ah? Does the BMW system have a specific amp hr to use? https://antigravitybatteries.com/pro...tive/ag-h6-rs/ And just in case your looking for the 12V rear...but its 2x pricey in comparison to OEM. https://antigravitybatteries.com/pro...tive/ag-h7-rs/ install vid in case you needed more info. Last edited by Burr001; 03-23-2024 at 06:25 AM.. |
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03-23-2024, 04:27 PM | #19 |
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Very interesting thread now that I have the '24 G02 for 7 months now. Need to learn more on the 48v Mild Hybrid system.
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03-24-2024, 11:12 AM | #20 |
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Charging and possibly overheating a hybrid’s lithium ion battery may be inviting needless risk of triggering a thermal runaway. It’s not a PHEV. I suggest you leave it alone. Google for more background.
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03-24-2024, 07:42 PM | #21 |
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This is probably one part you want to leave for the dealership. As for the 12v in the cargo area, you can change that with an H8 AGM. Need to re-program the system with ISTA or BimmerLink.
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