battery drain

Nickel oxyhydroxide battery (abbr. NiOx, IEC code: Z) is a type of primary cell. It is not rechargeable and must be disposed after a single use. NiOx batteries can be used in high-drain applications such as digital cameras.
NiOx batteries used in low-drain applications, have a lifespan similar to an alkaline battery. NiOx batteries produce a higher voltage (1.7V) than alkaline batteries (1.5V) which can cause problems in certain products, such as equipment with incandescent light bulbs (such as flashlights/torches), or devices without a voltage regulator.

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  1. tonybridge

    Car completely dead - eventually, AA called out

    I parked the MG4 in the Marina Car Park and headed out onto the canal in our Narrowboat. A week later, we returned and went to load up the car for the journey home. The car was completely dead, didn't respond to any attempt to open the doors. Guessing that somehow the 12V battery had failed, I...
  2. P

    12V battery problem?

    I bought an Mg HS PHEV on 21 nov 2025. Yesterday, it was dead. I had charged it overnight, but in the morning, I couldn’t unlock the doors, nor could I unplug the charging cable. I contacted the dealer 2km away, but he refused to send a technician. I had to Vaal the MG road assistance. They came...
  3. Chris H

    How long does the car stay 'on' when you don't lock it?

    Quite often I don't bother locking the car after I get out (we have a private drive on a quiet road). I take the key with me inside, which is out of range of the car. A few days ago I did this in the evening, then went outside again for something about 20 minutes later to find that my headlights...
    • Chris H
    • Thread
    • accessory mode auto shutoff battery drain headlight timeout keyless entry mgs5 vehicle security
    • Replies: 6
    • Forum: MG MGS5 EV Forum
  4. S

    MGS5 12 Volt Battery Issues

    Hi I am no expert on EV technology, but having issues with the 12 volt battery on my MGS5. The car has little use so may not be used for a few days, and on two occasions the battery has been very low with the AA suggesting a long run of an hour to recharge it. The second time the battery was so...
    • SFPlatt
    • Thread
    • 12 volt battery battery drain dashcam mg s5 ev mg5 parasitic drain
    • Replies: 9
    • Forum: MG MGS5 EV Forum
  5. M

    Battery drain again

    I bought an MG HS Trophy PHEV in June this year. It failed on me three times in the first 30 days through battery drain when parked overnight. Dealer assured me it was a 'known problem' and kept it for 10 days to update software, which they had difficulty with. On 26 December the same issue...
  6. asti1488

    Merry Xmas MGS5

    Hi recent member here , MGA5 on order expected late dec early Jan Beginning to read lots of electronic issues with this model, parasitic battery drains, boot not opening , car not opening, car not closing Car not charging , dealer issues, etc etc As it’s Xmas and I’m thinking have I made a big...
    • asti1488
    • Thread
    • battery drain boot charging dealer electronic issue mg5 ownership experience
    • Replies: 21
    • Forum: MG MGS5 EV Forum
  7. S

    MGS5 12V battery dead

    Has anyone else had a problem with the 12V battery becoming drained overnight? I returned my first MGS5 due to this problem and today I have had exactly the same problem with my replacement MGS5, arghhhhh.
  8. A

    Surprising behaviour

    Today we went to visit friends at 2pm and I must have forgotten to lock the car. When we came out just before six the car was still on - and because it had become dark all the lights were on. It doesn't seem to have caused a problem with the 12V battery, but I'm surprised that it didn't time out...
    • Amun
    • Thread
    • battery drain car lights driver seat sensor mgs5 vehicle shutdown
    • Replies: 5
    • Forum: MG MGS5 EV Forum
  9. Pwt307

    Replacement Car

    After almost exactly 8weeks of going into and out of dealership, old car brand new, picked up 18/9 hybrid + trophy Hampstead grey has been exchanged/replaced by Hybrid + black pearl below. It’s been a journey, and really hope I made right decision to replace rather than reject. To be fair...
    • Pwt307
    • Thread
    • battery drain dealership flat battery infotainment system mg hs hybrid+ usb disk
    • Replies: 3
    • Forum: MG HS Hybrid+ Forum
  10. I

    Help!

    Hello all, Walked out to my 2024 MG ZS EV after 2 weeks not driving, pressed the key fob...nothing. Thought it might be dead, changed the fob battery, still nothing. Used the emergency key to get in, tried to start, dead as... Waiting for RAC to give me an arrival time but, in the meantime...
    • Ian 2455
    • Thread
    • battery drain breakdown key fob mg zs ev rac assistance
    • Replies: 9
    • Forum: MG ZS EV Forum
  11. bilbo

    USB Recognition Failed

    Has anyone else had this error with the S5? It's not related to anything plugged into the USB sockets, but rather a problem with the DAB radio. See below from the MG4 forum: I've had this twice now, i.e. get the message, then radio freezes. After the first time I did the dis/re connect -ve...
    • bilbo
    • Thread
    • battery drain dab radio mgs5 nation radio south radio freeze software update south hampshire dab usb error
    • Replies: 5
    • Forum: MG MGS5 EV Forum
  12. B

    Parasitic drain on 12V battery

    Hi, I bought a brand new MGS5 Trophy 61kWh on 8th Aug 25, on the15th Sept 25 (a month later) the 12V battery was depleted. I don't use the car with just the 12V battery running, I make sure the car is in the ready mode. The AA said I have a parasitic drain on the 12V battery. MG had the car 6...
    • Big L
    • Thread
    • battery drain electrical fault mgs5 parasitic drain trophy 61kw
    • Replies: 177
    • Forum: MG MGS5 EV Forum
  13. Rolfe

    Will Caliban start on Monday morning?

    Will Caliban start on Monday morning? Place your bets. So here I am in a hotel car park and my friend went in to sort everything out. She paid for five nights in advance (she got a good discount) but we can't take the car out during that time. I'm on 20% battery and concerned that the 12v won't...
  14. T

    USB Power

    I purchased Ottocast wireless adapter cp82 u2-air pro carplay for my Mg EHS 2021. The device drained the car battery since the usb port stays on. Any suggestions?
  15. S

    Mg5 long-range 12V not charging

    Hi all.. I do 1 HR journeys daily and also plug in overnight The below image is from 7am after an overnight charge....no schedule restrictions so has been plugged in constantly...50% charge Isn't the 12V meant to charge as well.. I'm sick of panicking every morning that the battery won't be...
    • splreece78
    • Thread
    • battery drain charging issue long range mg5 rac
    • Replies: 6
    • Forum: MG5 EV Forum
  16. S

    Deep sleep

    Hi guys. I have had the car when new in 2022 and had always thought that it's my spot where the coverage is poor hence I was not able to get the app to connect to the car often... I then discovered that app connection is still very hit and miss wherever I go and I am starting to dig deeper...
    • SKA
    • Thread
    • battery drain connectivity deep sleep mg zs ev remote app telematics
    • Replies: 1
    • Forum: MG ZS EV Forum
  17. M

    MG HS Hybrid battery drain

    Hi I took delivery of a new MG HS Hybrid on 27/6/2025. I have had to call MG assist 4 times due to flat battery. The car is going back to the dealer, but have requested a replacement vehicle. Has anyone else experienced this problem?
  18. Seajays

    Had the Dreaded 12V Battery Drain Overnight

    So having never had an issue in the last year, and regularly checking the 12V battery every few months with a top up charger, I was happy that the 12V battery was good. Unfortunately on Saturday I went out on the dual-carriageway and it was raining, but not dark enough for the auto lights to...
  19. M

    Car battery drain and car dead after 3 months

    Bought new MG4 XPower in october, in december the battery was dead i could not even get in the car, garage gave me a 'story' it was software and updated it. Now three months on it has happened again. Spoke to a guy who worked at MG and this is a known issue with a cable to the radio that drains...
    • masty
    • Thread
    • battery battery drain car battery drain mg4 mg4 xpower
    • Replies: 12
    • Forum: MG4 XPOWER EV Forum
  20. Z

    Alarm triggering

    I have a problem after starting the car, the key error is written on the screen and when I stop, the alarm goes off.If I change the battery in the key, it doesn't do it for 14 days. I have a problem that the battery in the handle has only 2.8V after 14 days.Why does the battery in the key drain...
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