When replacing your battery, be sure to use a high quality unit.
Replacing the battery can be done in a short amount of time.
Check out our Basic Maintenance section, which has all the parts you'll need to get your vehicle running its best, including filters, fluids, brakes, spark plugs, lighting, and more for your E90!
Hot tip
Wear eye and hand protection.
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Figure 1 The battery in BMW E90 models is located in the right side of trunk, behind a trim panel. Read battery connection notes before disconnecting battery. Before disconnecting your battery, remove key from vehicle and store in a safe place and note radio presets. When battery is reconnected or loses its charge, the following items may need attention (depending on vehicle equipment). You may have to reset your clock, enter radio presets, initialize power windows, initialize the sunroof and normalize the steering angle sensor. Once your battery has been replaced, you will have to register the new battery with the vehicle computer system. This tells the DME the age and health of battery to ensure proper charging.
Figure 2 You can connect a battery charger directly to the battery or under the hood at the positive (+) and negative (-) grounding point junction. The battery junctions are located at right front strut tower, green arrow points to positive, yellow points to negative. However, I suggest removing battery from vehicle when charging. This will avoid filling your trunk with gas that the battery emits during charging. Follow the manufacturer's instructions on setting and using the battery charger. Jump Starting vehicle: A vehicle with a discharged battery can be jump started using a good battery or a good battery in another vehicle. When jump starting: Be sure to work in a well ventilated area, batteries can produce an explosive gas. Wear gloves and eye protection and if battery acid comes in contact with your skin, immediately flush with water and seek medical assistance. Move both vehicles close together but do not allow then to touch. Turn ignition OFF in both vehicles.
Figure 3 Connect one end of positive jumper cable to positive (+) battery terminal of vehicle with good battery. Connect other end of positive jumper cable to positive (+) junction terminal (green arrow) vehicle with discharged battery. You will have to flip open lid on positive (+) junction connection. Connect one end of negative (-) cable to negative (-) battery terminal of vehicle with good battery. Connect other end of negative (-) jumper cable to negative (-) junction terminal (yellow arrow) of vehicle with discharged battery. Start engine on vehicle with a good battery. Allow to idle, then raise engine to 2000 RPM. Next, start engine of vehicle with discharged battery. Once vehicle with discharged vehicle starts, shut OFF any electrical accessories, radio, HVAC blower, etc. Carefully disconnect jumper cable in the reverse order you connected them in. Allow vehicle with dead battery to idle to recharge the battery.
Figure 4 Working in trunk, twist trim panel lock counterclockwise then open and remove trim piece. (green arrow)
Figure 5 Using a ratchet and a 10mm socket, disconnect negative (-) battery cable. (green arrow) Move negative (-) cable aside and cover so it does not accidentally come in contact with battery terminal.
Figure 6 Release locking clips and open battery safety terminal cover. (green arrow) Photo shows lid open. There are two plastic locks on each side of lid you have to release.
Figure 7 Release locking clip and open battery power module cover. (green arrow) Photo shows lid open. There is a black locking tab you have to release. Press tab toward front of vehicle and open cover.
Figure 8 Then using a ratchet and a 13mm socket, remove battery power module nut. (green arrow)
Figure 9 Then using a ratchet and a 10mm socket, loosen positive (+) battery cable. (green arrow)
Figure 10 Lift battery power module up and remove from battery. You will have to detach clips at side that lock onto battery. Lift positive (+) battery cable off battery and lay aside.
Figure 11 Using a 10mm socket, loosen and remove battery hold down. (green arrow) Then disconnect battery vent hose. Lift battery up and remove from trunk. Be careful and make sure you have a good grip, the battery is quite heavy. You will have to move cables around and keep them out of the way as you remove battery from vehicle. Clean battery compartment thoroughly. Clean corrosion from battery cable ends if present. Before installing new battery, check that battery vent line is not pinched, in good condition and properly routed. Replace if needed. Install battery in compartment, attach vent line. Connect positive (+) cable. Next connect negative (-) cable. Install battery hold down bracket. Then reassemble trim cover and trunk carpet. Once installed, you will have to use a BMW scan tool to register the battery. This can be done by a capable BMW shop, I recommend doing it immediately after replacing your battery.
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