What is draining my BMW battery?

• Plugged in external devices.
• Plugged in OBD-II scanner.
• BMW Intelligent Battery Sensor.
• The infamous ”hedgehog” (from the climate control panel)
• One of the electronics on your car drains too much power or does not go into sleep mode.
• Faulty alternator.
• Old battery.

What would cause car battery to discharge overnight?

When you car battery discharges soon after shutting down the engine, it’s commonly caused by one of three things: Your battery may have reached the end of its service life (often 4 or 5 years). A parasitic drain is depleting battery power. A problem in an electrical system is affecting battery power.

What is draining my car battery when its off?

What may drain a car battery when it’s off are things such as interior lights, door lights, or even bad relays. While your engine runs, the alternator recharges the battery — which is why you typically don’t have to worry about the battery dying while you’re blasting the radio on your drive to work!

Why does my battery drain so much overnight?

Google services aren’t the only culprits; third-party apps can also get stuck and drain the battery. If your phone keeps killing the battery too fast even after a reboot, check the battery information in Settings. If an app is using the battery too much, Android settings will show it clearly as the offender.

What drains a BMW battery?

BMW Intelligent Battery Sensor. The infamous ”hedgehog” (from the climate control panel) One of the electronics on your car drains too much power or does not go into sleep mode. Faulty alternator.

How do you check for a parasitic battery drain?

How To Diagnose the Battery Drain

1. Step 1: Remove Negative Battery Cable. Negative Cable Removed.
2. Step 2: Check the Draw Across the Negative Cable and Battery Post.
3. Step 3: Remove and Replace Fuses.
4. Step 4: Isolate and Fix the Issue.
5. Step 5: Replace Negative Battery Cable.

Can a bad alternator drain a battery overnight?

A malfunctioning diode in the alternator can create a parasitic drain on a car’s battery. Diodes should allow current to pass in only one direction, but a bad diode will keep the charging circuit open even when the engine in not running, allowing the battery to go dead. This often happens overnight.

How do you stop a car battery from draining when not in use?

How to Maintain Your Sitting Car Battery

1. If in a secure garage, disengage security system to preserve battery.
2. Charge battery weekly by driving car for at least 30 minutes.
3. Disconnect the negative battery terminal to preserve your battery.
4. Get a portable jump-starter.

Can a bad starter drain a battery overnight?

The starter will draw a charge from the battery. The vehicle may still start; however, it will continue to draw too much power and will drain the battery.

How do I find out what’s draining my car battery?

Pull the negative off the battery. Put the test light between the post and the ground wire. If the light illuminates, you have a draw. Use the fuse pull method to find the draw; when the light goes out, you found the draw.

How do I find out what is draining my battery?

Settings > Battery > Usage details Open Settings and tap on the Battery option. Next select Battery Usage and you’ll be given a breakdown of all the apps that are draining your power, with the most-hungry ones at the top.

Will bad alternator drain battery?

A corroded or defective alternator diode will faultily continue charging the circuit even when the car off. This, in turn, will drain your car battery and cause the car not to start.

How do I stop my battery from draining overnight?

The Basics

1. Turn Down the Brightness. One of the easiest ways to prolong your battery life is to turn down the screen brightness.
2. Mind Your Apps.
3. Download a Battery Saving App.
4. Turn Off the Wi-Fi Connection.
5. Turn on Airplane Mode.
6. Lose the Location Services.
7. Fetch Your Own Email.
8. Reduce Push Notifications for Apps.

How much battery drain is normal overnight?

How much battery drain is normal overnight? Around 10% of battery drain is normal overnight due to its background apps processing. There are certain apps that run in the background and drain some battery. There is nothing to worry about if the draining percentage of your phone’s battery fluctuates around 8-12%.

How much battery should I lose overnight?

Android phone manufacturers, including Samsung, say the same. “Do not leave your phone connected to the charger for long periods of time or overnight.” Huawei says, “Keeping your battery level as close to the middle (30% to 70%) as possible can effectively prolong the battery life.”