By YOUCANIC on May 29, 2019
In this guide, you will learn how to properly jump start a BMW battery. Common causes and symptoms of dead BMW battery include: you can't start the car, unlock the doors or the trunk.
Follow the instructions below to learn how to properly jump start a BMW.
Common symptoms that you may experience if your BMW battery is dead.
Do NOT jump start a dead BMW by connecting jumper cables to the battery located in the trunk. Use the terminals in the engine compartment which are designed for jump-starting a BMW. See instructions below.
Watch video on how to connect jumper cables to a BMW.
Many BMW owners ask how do I get into the trunk if the BMW battery is dead.
These instructions work on all BMW models including 1-series, 2-series, 3-series, 5-series, 6-series, 7-series, X1, X5, X6.
It is important to follow the proper procedure to jump-start a BMW. If you don't or jump-start a BMW by connecting jumper cables to the battery located in the trunk you can cause electrical issues.
BMW engineers have made it difficult to get access to the trunk when the battery is dead. You don't want and shouldn't jump start a BMW directly from the battery. This is a common mistake many roadside assistance technicians make.
If you read on BMW forums you will find hundreds of cases where control modules were damaged by improperly jump-starting a BMW this way. Costing car owners thousands of dollars in repair.
If you have a good reason to get in the trunk but the battery is dead this is what you should do.
Replacing the battery on a BMW is expensive because not only do you need a new battery, but it also needs to be registered. The typical cost of a BMW battery replacement range in the $400-$500.
Before you spend hundreds on a new battery we recommended to use a trickle battery charger to bring the battery back to life instead of jump-starting the car and letting the alternator charge the battery.
By trickle charging a dead BMW battery, you have a better chance of bringing the battery back to life. Otherwise, your BMW may no longer hold a proper charge.
It will take at least 24 hours to bring a completely dead battery back to life. You are only providing 2 Amperes to the battery which is a slow charge but ensures no damage is caused to the battery cells.
Don't leave the keys in the ignition as your BMW charges.
If your BMW keeps on dying or is not holding a proper charge it could be due to any of the following:
If your BMW is over 7 years old you are driving on borrowed time. Sooner or later you will need to replace the battery.
You can replace a BMW battery yourself. Just make sure to perform the battery registration procedure.
Here is a list of articles that will help you replace a BMW battery.