2007 BMW 320i E90 Battery

I didn't dive my car for 8 months, now the car can't start. Tried to charge the battery to 12V but when connect it back to car voltage dropped back to 2V in 30s.

Thinking need to buy a new battery, checked Supercheap Auto by entering select my car, it only gave me option to buy one battery which is $289.99. Is that really the only one I can use?

Thanks

Comments

    • +7

      What sort of sorcery is this? Some sort of "search engine" wizardry?

      • +2

        They don’t use indicators either.

  • Check with a few other battery specialists…

    Your issue will be installation and engine control unit registration of the battery which you'll need a diagnostic scanner to do apparently.

    https://bmwrepairguide.com/bmw-e90-battery-replacement/

    • Engine control unit registration of battery? This is getting ridiculous. What a stupid ‘upgrade’.
      If it needs to register the battery why didn’t the onboard computer have an option.

      • +4

        Its a fair price to pay to drive a high yield vehicle.

      • +2

        The car charges the battery at different voltages and rates depending on its age - these things are full of power-sapping electronics and I suspect this was necessary to get the batteries to last as long as they do. I've got one of these and the battery is still working fine after 9 years.

        You're right though, it's a bit of a shame that you can't register a new battery without the appropriate tools/software. Then again, if you require $100s worth of mechanic's tools to physically change brake pads or a battery, is it unreasonable to also require special tools to configure these things with the vehicle computers?

        I believe the official solution is expensive BMW-licensed software and interfaces.
        These days, though, you can, ahem, obtain the software for free, run it on a spare laptop, and plug it into the car with a $30 K-CAN cable.

        • +1

          You don't have to code the new battery in. The battery might only last 8 years instead of 10.
          If you want to code it yourself you can buy an OBD adaptor for $59.99 and buy the BimmerLink app.

      • +2

        Engine control unit registration of battery? This is getting ridiculous. What a stupid ‘upgrade’.

        Before you get all angry, you need to realise that the reason for battery "registration" is to extend the life of the battery. It's not registration like software activation, it's just telling the onboard computer that a new battery has just been put it so it can adjust its charging curves which changes as the battery ages.

        It's not uncommon for those E90 batteries to last 8-10 years.

        You can register it yourself if you buy an OBD adaptor and an app like BimmerLink.

        With the same OBD adaptor and the purchase of the BimmerCode app, you can also tweak the car's settings.

        • Otherwise, it will cook the new battery quick smart as your car will charge the battery at the same rate as it used to with the old battery.

  • +6

    Owns Euro car, doesn’t like paying Euro prices… :D

    • +2

      Op should price up a Mazda stop start battery, will make his look like a bargain.

      • Does the Mazda need all the ECU resets and battery calibration like the BMW's do? OP is in for a rude shock when they put the new $285 battery in and dont do the calibration/reset procedure if required.

    • OP’s car seems flaky already.

  • +2

    A 2007 Camry wouldn't do this…

  • Do not buy a cheap battery. Euros need calcium or glass plate batteries. These are designed to give constant power during startup without a voltage drop. This is important because all of the electronics need to "wake up" and communicate, and if the voltage drops you will have warning lights and problems. BMWs have also had large batteries in comparison to other brands.

  • Battery is located under a cover in the right hand corner of the boot. Just turn the little knob, lift the cover out of the way, and you will be able to see the battery.

    Ideally you should replace the battery with one of the same capacity (Ah) and type (standard or AGM). If you change the capacity or type, the car needs to be reconfigured (coded) for the new battery, and this is not straightforward; I'm not sure if a battery shop would be able to do this. Replacing the battery like for like, it just needs to be registered, which is much simpler. I'd expect most battery shops to do this for you with installation.

    The bigger AGM batteries (my E90 had a 90Ah AGM) can get pretty expensive. Hopefully you don't have one of those in there already.

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