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Really Dead Battery after 24 hours


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I bought a 2018 AWD V6 Edge three weeks ago. Earlier this week, at 850 miles, I parked the vehicle on Sunday after a four hour drive and left it until Monday night. I opened it to get something out and locked it. On Tuesday night I went to open the car and the battery was completely dead. I was unable to use the key fob or Keyless Entry to open the car, so the tow truck driver had to use the "real" key to open the door. He jump started the Edge and it started right up, but the clock, date, radio stations, etc. were all reset to factory settings. I drove it 50 miles to the nearest Ford dealer who did a complete check of the electrical system: battery check, check for shorts, etc. They said they could find no codes or anything to explain why the battery went dead: no shorts, battery good, etc. They said I must have left a door open or something, but I know I didn't, and anyway, I thought the electrical system would shut off anything automatically after 10-45 minutes.

 

So, does anyone have an idea what I should do next? My wife doesn't want to drive the car if the battery can go dead in 24-48 hours with no identifiable cause. My local dealer is reluctant to run diagnostics since they say the warranty does not cover it if the car isn't broken.

 

p.s. if I am posting in the wrong forum, let me know and I'll repost correctly. Thanks.

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It was reported on other models / years that keeping the IA FOB inside or too close to the car causes it to wake up and remain awake until the battery is drained.

 

Others reported that the ACM was turning itself on and draining the battery quickly. The fix was to replace the ACM (Audio Control Module). Believe I read somewhere that Ford issued a bulletin on this as it was happening on so many cars. Don't recall this happening on the 2018 though.

Edited by enigma-2
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If you leave the door open, the battery saver would kick in. The only things I believe you can leave on & drain the battery are the Hazard lights (flashers) and parking lights (not the headlight).

 

Another thing I'd suggest to check are the battery terminals, make sure the connectors tight.

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If I had a dime for every time a mechanic said a bad battery was good, I'd be sitting on a big ass pile of dimes.

Q. How many dimes does it take to make a battery?

 

I have a Solar BA-7 and it showed my (old) battery was failing. Had it tested at local Ford dealer with a coupon and it passed with flying colors. TWICE! Failed about a month after the second check. Dealerships don't have the proper testers to test a modern battery. Their tester measures voltage and a with modern car you muse measure capacity. So that's my $0.10 worth.

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Q. How many dimes does it take to make a battery?

I have a Solar BA-7 and it showed my (old) battery was failing. Had it tested at local Ford dealer with a coupon and it passed with flying colors. TWICE! Failed about a month after the second check. Dealerships don't have the proper testers to test a modern battery. Their tester measures voltage and a with modern car you muse measure capacity. So that's my $0.10 worth.

Amazing how we can get accurate test results with a $75 tester but the dealerships can’t.

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Amazing how we can get accurate test results with a $75 tester but the dealerships can’t.

 

I once had a MotorCraft battery that had a cracked case that caused the positive terminal to corrode very fast, when I took it to the dealer for replacement they still connected their tester & told me it passed the test! :doh:

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