battery management system

A battery management system (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack), such as by protecting the battery from operating outside its safe operating area, monitoring its state, calculating secondary data, reporting that data, controlling its environment, authenticating it and / or balancing it.A battery pack built together with a battery management system with an external communication data bus is a smart battery pack. A smart battery pack must be charged by a smart battery charger.

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  1. Giller

    S6 conventional battery monitoring.

    So today I checked the status of the conventional battery about lunchtime and given the result have been keeping an eye on it during the rest of the afternoon, so far no topping up, the cars not been out, not suggesting a problem, just posting for info.
  2. fshuk1

    Do not trust SOH. Interesting point. Kia discussion not MG.

  3. A

    Normal mode 88% power?

    I have noticed a common theme and wondered if others are seeing this, but also a contradictory finding in the same respect, that I cannot place. Basically when the S5 is in normal mode I see an 88% or 87% power threshold, then at other times I see upper 90s or 100% being given. What gives? 😆...
  4. LeedsLoiner

    Range anxiety

    Hello all. Can anybody tell me how long my ZS ev 2025 will keep going for when the battery is approaching zero volts? Does it stop straight away or does it have a reserve, therefore reducing range anxiety. My old car, a Honda Jazz when it reached empty used to say you have so many miles...

  5. 12V Battery: FLA or AGM?

    My special thanks to @Joningy for pointing out that his 12V battery, is in fact an FLA. And apologies to everyone for my naivety; I had assumed that in 2025, all ev manufacturers had stopped using FLA and were either using AGM or lithium technology. I was nearly right, but MG have stuck with...
  6. G

    MG5 SW 2022 chargin issues

    I bought this year last year, so for me new and my first electric. Ever since I've had it won't charge on the super fast chargers higher than 40kwh. The dealer says there's nothing wrong with it and can't find anything wrong. It therefore takes forever to charge when these vehicles can actually...
  7. mgaz

    Battery balancing. No

    How can I tell if the battery is balancing after the 100 % charge is complete? I leave my Ohme charger connected for hours but how do I know it is balancing as no display or port lights are on? MG S 5 ev.
  8. M

    Bms update 2024Hi

    Hi everyone, newbie in MG Zs ev and would appreciate some help. Few weeks ago on my way from work, suddenly my Mg zs ev my21, displayed several faults,mostly with driver assistance packages (ACC, Hill Asst,Brake asst, forward collusion warning, e.t.c) not available. I called MG dealer and I...
  9. Zoomy

    How's my battery pack?

    OVMS readings. Starting SoC 50%. 4 hour charge so would have one hour of balancing A01 BMS release so the early BMS gate fix Never seems to get to the highest reading on OVMS, which was typically 98%+for most. SoC not that far off though. 40k OG ZS from the original 1000 batch in 2019 OVMS#...
  10. O

    First scheduled charge

    Last night gave the car its first charge. I have a 3 phase Morec 11kw box , plugged in and was monitoring every hour, the morec box gives you a battery temperature display. At the start temp was 28c and charging 10.2 kw after a hour 10.2 kw and 60 c , later 10.2kw and 62.2c. I was putting in...
  11. E

    Battery management system

    Hello, I have just recently got my MG ZS EV mk2. I have successfully binded the car to the app however I cannot change the target battery level to 80% after a lot of thinking in the app I get a failed message. Also when trying to do it from the car directly i get the below error exactly as...
  12. P

    Mismatch with %age and efficiency on MG5 Long range EV

    We’re really enjoying our new MG. 890 miles now from new as a pre-reg with 6 miles on the clock. I’d be really grateful for any thoughts please. . . I did a balance charge after 712 miles on our granny charger overnight yesterday and travelled 89 miles straight after this morning using 39%...
  13. G

    MG4 51kwh Battery Management System problems?

    Hi, Anybody having battery problems with their MG4? I've had no problems up until this last week, now suddenly the cars battery seems to drain at an insane rate. Last week my car dropped from 52% down t0 31% within 19 miles and an average of 2.5kwh efficiency (anyone else seem to think there...

  14. Second service BMS issues

    Second service BMS issues We have an early gen1 ZSEV Exclusive, low mileage, that we registered from new in 2020. It went through all versions of the BMS updates because we were having timed charging problems and needed to ensure any vehicle software issues were eliminated. By August 2020 it...
  15. profdraper

    Best battery charging practices

    I wonder if longer term owners of the 2021 MG ZS EV might be able to share their experience about battery charging? I've owned the ZS EV for about six months now and almost always charge at home on a 7kW wallbox scheduled for overnight off-peak power rates. This practice follows the MG...
  16. S

    BMS - which version?

    I have my service scheduled for later today and want to ensure I get the BMS update that allows for more rapid charging. I rarely ever see much more than 60 kW, and then only for a few minutes. My MG is just over two years old, had its last service in Sept 21. During that service they did no...
  17. Zoomy

    EU4 BMS

    There's a new ZS BMS out with a build number ending in "EU4". This replaces the A01/EU1 BMS, which resolved all those balancing issues. Has anyone had it and were you made aware of the differences over the previous release?
  18. Davemac278

    BMS and Infotainment versions

    Had my first service yesterday. Free from MG due to faulty BMS fix in January 21. I told service desk that I wanted the infotainment update done and said I thought it was SA0020. Took car in at 8.30am, took new long range demo car out and waited on update on when my car would be ready. Thought...
  19. R

    To update or not (BMS)

    New MG ZS EV first edition owner here. My ZS EV build november 2020, seems to be on an older BMS. I asked for all latest updates on delivery, but I have no KERS when fully charged and the battery has 454voltage when full. So guess they said yes, but did nothing. (Shows 268km on E with HVAC off...
  20. BruceT

    BMS- Battery balancing etc

    I'm sorry, I know this has been asked before, I was reading it, now I can't find it. My battery says this....... As you can see 98 miles, the fuel level gauge thingy is reading 5 bars out of 8. should my voltage be showing 411v? Seems really low, I mean I wouldn't want to put my fingers in...
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