Pulled fuses 36 and 55 and read that they are supposed to be showing 12v but are reading 2v. Two hints: 1) battery used to spark when connecting ground, but no longer does. This tells me it isn’t drawing current. 2) Before this happened, the battery once took 15 seconds to power the car after connecting. Where is the battery on a 2009 BMW 3 Series? The battery in your 2007-2013 BMW 3 series is located in the trunk on the right side of the vehicle. It is easily accessed by removing the right trim panel. 1. Open the boot. 2. Locate the battery under the boot floor cover. 3. Using the 10mm spanner loosen off the nuts off the hold-down bracket and remove it. 4. Use the Phillips screwdriver to remove the clamping bracket / machine screw on the right hand side of the battery. 5. The next morning see if it's at least 12v. If so you're probably OK. If not repeat the process, but this time disconnect the battery negative terminal. If it still loses its charge overnight the battery is bad. If not you've got a parasitic drain when the car is not running. Appreciate 0. Quote. The average cost for a BMW 535i battery replacement is between $430 and $457. Labor costs are estimated between $105 and $133 while parts are priced at $324. The battery in your BMW E46 3 series is located in the right (passenger) side of your trunk compartment under the black plastic tray. Remove the plastic tray to gain access to the battery. To begin the BMW E46 battery replacement, use a 10mm socket wrench to remove the two battery terminals, starting with the negative first. The new 3 series (E90) uses a MOST-Bus structure, similar to that used on E60/61/63/64/65/ & E66, as a means of connecting the Information and Communication Systems (IKT). MOST is a data bus technology developed & standardized for automotive applications and stands for Multimedia Oriented System Transport. The average price of a 2020 BMW 3 Series battery replacement can vary depending on location. Get a free detailed estimate for a battery replacement in your area from KBB.com BMW DEAD BATTERY, HOW TO JUMP START F30 F31 F32 F33 F36 320i 328i 420i 428i 318d 320d 420d 335i 418iIf you your battery is dead and you need to jump start it When coasting, decelerating or braking the the alternator is coupled and the battery charged. You will see the blue line going towards the battery when this is occurring. There is a BC panel that shows it along with the MPG for the selected trip data bucket. Attached Images. __________________. 9RB7X.