Battery Discharge

[Reemas Dreemas]

have anyone had this problem? dealer said they checked entire electrical system and everything was fine. Took the car home and it popped up again. been happening for a few weeks now. car is currently back at the dealer.

[SapphireM5]

Did you happen to check the volts when the message came up? I just got my M5 last week and while cleaning it I had the doors open and getting aquatinted with the car I got the message that battery was discharged and electronics shutting down. I checked the volts and it read 12.5v. From my research these cars are very picky with the electronics. Many shorts trips etc and the battery doesn't get a full charge. It has been recommended to use a battery tender for (ASM) batteries. Hooked up my tender and no issues. Maybe that's what's happening to you. GL though

[momos750]

The electrical systems are very sensitive in these cars. If you don't drive it for longer distances you may get that warning.
I put mine on a CTEK battery charger about once a week overnight and that tops up the battery.
CTEK is one of the best IMO, they make them for BMW who rebrands them as their own.

[Mbdurham17]

Seems like the dealer changes the battery in mine at every scheduled maintenance

[SFT33]

Did you leave your phone plugged in without properly shutting down the car?

[GB///M]

Had this problem before. Dealer couldn't find anything wrong with the car either. They then started looking into the comfort access system testing all the door handles and found one of them was only working half the time. It would only lock/unlock by touching about half the time. Turned out to be a faulty door handle that was causing the battery drain and it never threw any errors. New door handle was ordered and after it was changed never had this issue again.

[Reemas Dreemas]

Recieved a call right after, posting and as GB said thats exactly what it was. my rear right passenger door handle was causing the problem. they order the part and supposed to arrived in 3-5 business days.

[Reemas Dreemas]

Originally Posted by SapphireM5

Did you happen to check the volts when the message came up? I just got my M5 last week and while cleaning it I had the doors open and getting aquatinted with the car I got the message that battery was discharged and electronics shutting down. I checked the volts and it read 12.5v. From my research these cars are very picky with the electronics. Many shorts trips etc and the battery doesn't get a full charge. It has been recommended to use a battery tender for (ASM) batteries. Hooked up my tender and no issues. Maybe that's what's happening to you. GL though

congrats and i never checked the voltage.

[SapphireM5]

Originally Posted by Reemas Dreemas

Recieved a call right after, posting and as GB said thats exactly what it was. my rear right passenger door handle was causing the problem. they order the part and supposed to arrived in 3-5 business days.

Glad they figured it out, electrical issues can be the worst! I would still consider a battery tender if you dont drive the car much or only do short trips. GL!

[Reemas Dreemas]

I'm daily. car is currently at Tenafly. if you need service i recommend.

[GB///M]

Originally Posted by Reemas Dreemas

Recieved a call right after, posting and as GB said thats exactly what it was. my rear right passenger door handle was causing the problem. they order the part and supposed to arrived in 3-5 business days.

Nice glad to see they will get it taken care of.

[AGS]

I saw a post last year on this issue. Another member heard from his SA that a contributing factor is the BMW Efficient Dynamics. The alternator only engages to charge the battery when decelerating. Apparently most American's driving style is heavy use of the brakes and less so engine breaking. If you generally don't engine break it'll take longer drive times to charge the battery.

[DingolfingLove]

Just a FYI on batteries - if you use a trickle charger, make sure the battery is in good condition and the car is in a reasonably ventilated area - batteries on charge can discharge hydrogen and when this comes into contact with a point of ignition, there is an exothermic reaction, as in kaboom !

[Matos]

So whats the solution ?

[Reemas Dreemas]

its exactly what GB said.... faulty door handle..

[steeve13m]

I had the same problem....swapped the battery for a redtop group 34 optima battery and all is good now

[Dracon]

Originally Posted by Mbdurham17

Seems like the dealer changes the battery in mine at every scheduled maintenance

Supposed to be every over oil change according to the service bulletin for it.

The cooling system on the vehicle is known for killing batteries, especially if you drive short distances on the regular.

I had to fight BMW of Nashville to replace mine recently because it was dying and discharging within a couple hours. They eventually replaced the battery and well has been well.