01-29-2020, 03:02 PM | #1 |
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As the proverbial doornail!
I parked my 2019 X7 40i in my garage two weeks ago and had hip replacement surgery the next day. The vehicle is six months old with 9K miles on it, all long highway trips.
Yesterday my daughter went to get something out of my car and it wouldn't open. I gave her the other fob and that too wouldn't work. The battery was dead. I had BMW roadside assistance come out, they jumped the car and it immediately started. They then took it to my dealer on a flatbed. Today the dealer called the car was done. They replaced the battery. I questioned this wondering why it went dead in two weeks. He said there are so many constant drains with all of the electronics on the car, any time you will leave it over a week, you should put it on a trickle charger. This just doesn't seem right to me. I have left other cars for months and they started right up. My 67 Corvette sat all winder and started right up. I know there are no electronics to deal with, but that short of an interval you loose reliability? Any thoughts? |
01-29-2020, 03:16 PM | #2 | |
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01-30-2020, 01:14 PM | #4 |
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01-30-2020, 04:02 PM | #5 | |
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01-30-2020, 04:10 PM | #6 |
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Well there are quite a few electronics on this beast and many that are proximity based.
Can’t say for sure what happened to your vehicle while you were out for surgery (hope all worked out) but your X7 could have stayed on due to CA etc. Your vehicle could have had a poor battery from the get go. It’s been known to happen. These are not your traditional lead or AGM. The X7 uses the newer Li-ion types and can suffer different fates than your C7 era battery. I agree about the 1 week trickle charger thing as that should not be needed but like I stated, either you had a drain unknowingly (search for CA posts leaving car on etc) or a bad battery/charging system. Main thing is that you now have a new battery under warranty. |
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01-30-2020, 06:22 PM | #7 |
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I will be driving again in about a week. Hopefully it was just a poor battery. If however, it doesn't start in a week, we will have to change the mind of the service writer
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02-01-2020, 05:39 AM | #8 |
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Was the vehicle locked for the two weeks or unlocked?
As I said in another thread: If you don’t lock your BMW overnight you will run into real problems. I have an X4 and a 7 Series and this is well documented on the power hungry cars like the 7 Series. When you lock the car it puts the electrical system to sleep, except for the alarm, door sensors for comfort access and other essentials. If you don’t lock it, many other circuits remain active and will drain the battery. On the 7 Series if you do this too many nights in a row you will get a warning on the iDrive system advising of excessive battery drain. Lock the car each night and see if it makes a difference. Luke |
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02-01-2020, 10:20 AM | #9 |
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It locks automatically when I walk away from the car, so I assume that it was locked. It certainly was locked when I returned to find it dead. I had to use the solid key to gain entrance to the vehicle.
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02-01-2020, 11:27 AM | #10 | |
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I think this is an unfortunate electrical gremlin that needs to be addressed by the dealer.
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02-01-2020, 01:40 PM | #11 |
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Not that I am aware of. Also, it would be illogical to sell a vehicle that would require frequent driving or it be connected to an external, add-on battery minder.
Either the "service tech" was blowing smoke up my posterior, OR he was partaking in the recent legalization of hallucinogenic vegetable matter in Illinois. |
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02-01-2020, 03:58 PM | #12 | |
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