The battery of your vehicle is a wearing part, it is generally considered that it will have between 5 and 6 years of life span. You may have found yourself one day with a dead battery and not being able to turn on your Bmw Serie 3 E90. And quite often this is caused by a battery that no longer stores energy. So in this case, how do I disconnect the battery from my Bmw Serie 3 E90? Precisely, our team has created this content page in order to help you accomplish this simple task safely. Initially, we will give you some hints and tips on how to do it safely, and then we will put it into practice and how to disconnect the battery on your Bmw Serie 3 E90.

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How to disconnect the battery on my Bmw Serie 3 E90: A few tips

To begin with, before dealing with how to disconnect the battery from your Bmw Serie 3 E90, we will give you a few tips on how to do this operation safely and save you from wasting time, some of them will certainly sound obvious to you, but you can never be too cautious :

  • Before doing anything on your car, you must always place it on a flat surface with the hand brake on to prevent any movement of the Bmw Serie 3 E90.
  • The battery in your car is an energy accumulator, and can potentially send out a deadly charge to humans, so you will need to remember to turn off your vehicle’s ignition and remove any jewelry or metal objects you may be wearing to make certain you take as little risk as possible.
  • Moreover to being filled with energy, the battery will be filled with acid, a very corrosive chemical substance that can do a lot of damage to your skin. As a safety measure, wear rubber gloves and goggles to protect you from splashing.
  • At last when you go to the step how to disconnect the battery on your Bmw Serie 3 E90, don’t touch the two terminals of your battery, you may cause a short circuit with your body as a conductor.

How to disconnect a battery on my Bmw Serie 3 E90: Take action

Let’s begin now, the part that certainly brings you on this website, how to disconnect a battery on your Bmw Serie 3 E90. So, after having taken all the measures we detailed just before, you will finally be able to attack the removal of the battery from your car. For this, it will be very simple. First you will have to take out the plastic covers that protect the terminals of your battery. Verify the state of your terminals, if they are oxidized or very dirty, we suggest you to use a soft wire brush and baking soda to clean them before disassembling. Once the cleaning is achieved, you will first have to remove the negative battery terminal of your car using a nut and bolt (this is the black cable with a “-” sign), always in this direction as it is attached to the car chassis, if you first remove the positive terminal (red cable with a “+” sign) and touch a portion of the chassis, it would cause a short circuit. Now you can disconnect the positive terminal of the battery from your Bmw Serie 3 E90. Once both terminals are disconnected, you can start the last step, disconnect the battery from the engine compartment of your car. To do so, you just have to remove the rod and the clamp, commonly held by a nut or a torx bolt, and take it out of its place. Be careful though, a battery weighs very heavy, be careful and forceful, and also think about take it out vertically to steer clear of any acid leakage. That’s it, you have just discovered the technique for how to disconnect a battery on your Bmw Serie 3 E90, if you respect all the safety instructions, everything should go well. If you want to learn how to safely reconnect your battery, check out this content page, and if you want more information about your Bmw Serie 3 E90, we have a directory of articles dedicated to your automobile.

If you wish more guides on the Bmw Serie 3 E90, go to our Bmw Serie 3 E90 category.