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Warning signs before 12v battery fails?

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10 replies to this topic

#1 OFFLINE   mwr


    Fusion Hybrid Enthusiast

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  • Region:U.S. Pacific Coast
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  • Current Vehicle:2015 FFH SE
  • My Hybrid's Year:2015

Posted 13 May 2018 - 10:17 PM

I've had no problems at all with the 12v battery in my 2015 FFH, which is now 3 1/2 years and 50K miles old. Are there warning signs before the 12v battery dies and the car won't start? How long do these 12v batteries usually last? Or is there any "usually"?


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#2 ONLINE   md13ffhguy


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Posted 13 May 2018 - 10:58 PM

The first warning sign I noticed when the battery died in my 2013, was when the doors wouldn't unlock when the remote was pressed... That was 28 months in (car has since been replaced). My wife's 2014 is still on the OEM battery, with 100k+ miles. Maybe she's on borrowed time.


#3 OFFLINE   tclemmer


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  • Current Vehicle:2013 HyTi Fusion

Posted 14 May 2018 - 12:12 PM

Coming up on 5 years on my 2013. 65K miles.  I assume the first indication I will get will be when I desperately need to go somewhere and the car will be dead.  I am thinking about replacing anyways as 5 years appears to be a pretty good like on an OEM battery.




#4 OFFLINE   GaryA


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Posted 15 May 2018 - 03:50 PM

My battery took a dump at 5 years also. Does anyone know of an AGM type battery to replace the OEM one?

#5 OFFLINE   Texasota


    Fusion Hybrid Addict

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Posted 16 May 2018 - 12:34 PM

I believe Murphy installed an AGM in his FFE but he had to cut/modify the battery tray to fit it in. I have searched and have not found an AGM that fits the FFH.

#6 OFFLINE   Jiasong


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Posted 05 September 2018 - 10:38 AM

5 years and 4 months on my 13', still the OEM. 

#7 OFFLINE   aschulz261


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Posted 06 September 2018 - 02:25 AM

If your car is driven daily, I don't think there is any big warning of a battery needing replacement.  These cars don't need much to "turn on", so starting them isn't a problem.  I think the biggest thing people notice is 1 of the following:


1. weird electrical issues.  ie power window or door lock issues.

2. car goes in to battery saver mode on shutdown

3. battery just never seems to charge fully even after driving for an extended period.

#8 OFFLINE   ethermion


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Posted 18 November 2018 - 04:49 PM

All y'all spooked me.  Our FFH is my brides ride, and if she has weird issues, she will want a new car.


Ours is a 2013, so the factory battery was 6 years old.  Replaced just now.  Around $120 installed - installation is annoying.  Auto parts store dude said they don't do installs for hybrids.  Told them there auto parts dude that I bought the battery online, and online said free install.  Told auto parts dude to turn around and look at the sign in the window of his auto parts store - free install of batteries.  Men with man buns and tats are not necessarily tough.  This guy folded like a lawn chair.


Back to happiness.

#9 OFFLINE   majorkaos


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Posted 23 December 2018 - 08:20 PM

Have recently started seeing 'System off to save battery' displayed, and occasional glitch when attempting to unlock using the door handle. Never had problems locking with handle sensor or fob. 

Today unable to use the fob to unlock the doors or pop the trunk (also no response from door handles; am 2nd owner, 51K total miles). From rest (door lock indicators off), the only result I get from the fob's lock/unlock buttons is to light the front door lock indicators (not the rear, just both front doors), but no response from the trunk button. Once inside, unable to pop the trunk from the dash. Using inside trunk release to get to the battery, find it's 11ish volts, but it drops to 7-8 within an hour and, once again, unable to operate locks and trunk.


I found a workaround to start the engine: step on the brake (some panel displays, but only briefly), release brake, push the start button.... and the engine fires right up on battery and with full display. Gas engine will kick in per usual.


Once off it's a short time until the fob has no effect. Repeat the workaround and I can drive.

Today, while attempting to get the emergency key to work, the car alarm seems to have been triggered - no sound, just all the side lights flashing. A press of the alarm key turned it off.


Question: If it's the starter battery that needs to be replaced, is it just an anomaly that I can start the electric motor? Many thanks.

#10 OFFLINE   murphy


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Posted 24 December 2018 - 11:20 AM

The car doesn't have a starter motor or an alternator.  The engine is started by the high voltage battery but the 12 volt battery has to have enough charge to pull in the contactors that connect the HVB to the car.  You can always get into the cabin to pop the hood.  Attach a jumper battery or a battery charger to the jumper terminals under the hood.  If you have push button start, the key is inside of the back of the fob. A cover pops off of the driver door handle to expose the key slot.

#11 OFFLINE   lolder


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Posted 24 December 2018 - 01:42 PM

You need to change the 12 vdc battery.

Edited by lolder, 24 December 2018 - 01:42 PM.

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