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  •  » 2016 Mustang battery deader than a door nail again.

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    11/03/2023 5:56 AM  #1

    Greg B
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    Registered: 4/01/2013
    Posts: 1,709

    2016 Mustang battery deader than a door nail again.

    Ssffhh$$$$.   Is what I got to say about that.  We have been trying to drive it more.

    I know its charging ok, but there must be some kind of parasitic drain on the thing. 

    One symptom came up.   It periodically keeps saying key fob not detected, even if its in your hand.  Yes, first thing I did was replace the two batteries in the fob itself.

    Kind of wishing I'd have taken that offer right now...

    If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
     

    11/03/2023 6:35 AM  #2

    MAW
    I FYI 24-7

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    From: Memphis, Indiana
    Registered: 4/11/2013
    Posts: 336

    Re: 2016 Mustang battery deader than a door nail again.

    I feel your pain. I have 5 vehicles and it seems like I have to buy a battery every year or so.  They just don't last like they used to.  You might get a couple years out of them.  The best thing is to have one of those trickle chargers on a vehicle that sits for a while, because the worse thing is to let one go completely discharged. seems like they are pretty much toast after that. 

    66 Vert.  4.6 DOHC, 4R70 Auto, Heidt's M2 frontend
     

    11/03/2023 7:53 AM  #3

    Steve69
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    From: Madison Wisconsin
    Registered: 4/01/2013
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    Re: 2016 Mustang battery deader than a door nail again.

    Id second the trickle charger. 

     

    11/03/2023 8:13 AM  #4

    Greg B
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    Re: 2016 Mustang battery deader than a door nail again.

    Battery barely three weeks old.   I just drove it a week ago.   I have it on the charger right now.   It had 1.27 volts. 

    Wife was going to drive it to work this morning so I could change the oil in her Jeep.

    If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
       •Thread Starter
     

    11/03/2023 8:43 AM  #5

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,352

    Re: 2016 Mustang battery deader than a door nail again.

    Have you gone through the process of pulling fuses one at a time to see if you can isolate where the drain might be?

    On my BMW and on my Durango R/T, they both started that “fob not found” thing. Replacing with a new starting battery cured both of them. I realize you already bought a new battery.  I wonder if it would be worth having the new battery checked?   Also, both these cars were stated to require a computer reset when a new battery was installed. I did that on the BMW, but on the Durango   I just hooked up my battery charger to the system so it never lost power when I replaced the battery. It worked fine.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    11/03/2023 9:54 AM  #6

    Cab4word67
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    From: Portland, Ore
    Registered: 4/06/2019
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    Re: 2016 Mustang battery deader than a door nail again.

    I have trickle chargers on 3 of my 4 rigs. I sware by them as I went 18 yrs with a yellow top just by using the cheap one, truck would sit for 4 mounths and get drivin for couple days then get parked again. Never have bought an exspensive one. I got the last 2 on Amazon for $40. Here is a link
     https://a.co/d/4p0DNbi
     

    Slammed Big Blue, ran over the varmints that messed with the Stang. Now all is good in the NW
     

    11/03/2023 10:51 AM  #7

    Greg B
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    Re: 2016 Mustang battery deader than a door nail again.

    I just went out and checked on it.  It seems to be accepting a charge, so not pointing towards the battery.

    I'm going to try and download a schematic so I can dig into the 247 fuses and relays the thing seems to have.  Lol.   Start diagnosing once I know I have a good battery.   I don't have my stand up  charger with a load tester anymore.  Probably pull it out and find d someone to test it.

    Modern cars are too darn complicated!

    If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
       •Thread Starter
     

    11/03/2023 10:14 PM  #8

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,539

    Re: 2016 Mustang battery deader than a door nail again.

    my last optima lasted 18 years on my 66 so I bough a new one for the 65....I still have the old one I charged it but did not put it on anything I may charge it again an swap it on my old hunting truck when it needs one...I got what appears to be a new Diehard that was on the 65 when I got it....my swap it for the new interstate I just put on my suburban if i sell it soon and keep the interstate lol
     

    Its really me....I fixed my caps lock .
     

    11/05/2023 8:20 AM  #9

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
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    Re: 2016 Mustang battery deader than a door nail again.

    Greg B – the battery voltage reduced to 1.27v is very severe, if nothing else has changed, I’d suspect a bad battery.  There could be a short within the battery.  Note that even a bad battery may take a charge, but the charge may not last for long (if there is an internal short). 

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    11/05/2023 11:18 AM  #10

    Greg B
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    Re: 2016 Mustang battery deader than a door nail again.

    I ordered a Schumacher load tester on Amazon.  It isn't going to be here till tomorrow.

    I can't/didn't find any obvious draws on current.   

    It is currently running.   I drove it yesterday.  Unceremoniously turned over 25,000 miles.

    If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
       •Thread Starter
     

    11/05/2023 11:36 AM  #11

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
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    Re: 2016 Mustang battery deader than a door nail again.

    If a completely disconnected fully charged battery doesn’t hold a charge for a week or two my guess is it has an internal problem.
    I personally don’t expect any battery to last more than five years, if you get more it’s a bonus.

    These days everything seems to have a finite life, the manufacturers must install a microchip that has a chronometer set to disable the device after a certain period of time.
    I like conspiracy theories, even though I don’t believe many of them.🤪

    Last edited by Rudi (11/05/2023 11:39 AM)

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    11/06/2023 6:08 AM  #12

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,602

    Re: 2016 Mustang battery deader than a door nail again.

    The issue with batteries is the overuse of recycled lead.  The impurities contained in it lead to early failure.  If you want long life your best bet now is AGM instead of lead/acid. 

     

     

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