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Discussion Starter #1 (Edited)
2019 will be the fourth season for our GT, and we frequently take it up into the wilderrness north of us......I would hate to get stranded somewhere.
Would it be smart to replace the battery next Spring just to avoid any possible problems, or are you who own 2015’s all still on the original battery without issue?
And while you are reading this — what battery would you all recommend? Optima I know makes great batteries, or at least used to....red or yellow top?

EDIT:
Interestingly, Optima is telling me that none of their batteries will fit the car.....wow....and those Optimas are BIG $$’s too!! Almost $300 for a car battery??
 

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Wait till you start pricing a Motorcraft battery. Our battery is still the original in our 14. I've been looking for a good replacement myself. Always liked the Die-Hards. In Calif. you can't get one shipped to the house anymore, you have to go pick it up in a store. That sucks cause it's out of the way for us in the mountains.
 

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Discussion Starter #3 (Edited)
Wait till you start pricing a Motorcraft battery. Our battery is still the original in our 14. I've been looking for a good replacement myself. Always liked the Die-Hards. In Calif. you can't get one shipped to the house anymore, you have to go pick it up in a store. That sucks cause it's out of the way for us in the mountains.
I found a Duralast at Auto Zone for $169, with a 5 year guarantee. I do keep a trickle charger on the battery all winter, so that will probably help lengthen its life......just don’t want to be in the boonies and get the dreaded solenoid clicking noise and no crank.....I’ve heard it said that summer heat is harder on the battery than cold weather.

EDIT:
My Ford dealer wants $130 for the battery and only $15 to put it in for me....sounds like a deal if I go that way.
 

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Summer Vs Winter

I found a Duralast at Auto Zone for $169, with a 5 year guarantee. I do keep a trickle charger on the battery all winter, so that will probably help lengthen its life......just don’t want to be in the boonies and get the dreaded solenoid clicking noise and no crank.....I’ve heard it said that summer heat is harder on the battery than cold weather.
I've heard that too, but it defies logic. My thinking: First, quicker the engine starts, the less energy drawn from the battery. Since they can only stand so many complete discharge/charge cycles, it stands to reason, I think, that quick starting is important to battery life overall. Second, cranking an engine in cold winter weather HAS to draw more energy out: oil is thick and sticky in the bearings. And, it may take a bit longer to "catch", let's assume not though. Everything points to winter, if COLD, = BAD.

I live where summer heat, if it kills batteries, ought to be the harshest place on earth for batteries. 120+ degrees in summer, occasionally, 100+ for 3 months or more. Winter? Lowest 40s, highs 70s. I have 3 vehicles running right now. Took the battery I bought in 2010 out of my '04 Explorer 2 years ago, worried it might crap out, put it in my F-150. Still cranks like hell, 8+ years old. Bought '94 Mustang GT 5.0HO 2 years ago, battery is marked Mar. 12, cranks like hell, going on 7 years old. Explorer is 2, of course, bought at Wally-World. None of them has been exposed to really cold weather, all vehicles are "Desert" origins.

8 years is gotta be "pushin' it. I really think quick starting, as well as not drawing down while sitting using radio, etc., is important to long life. Unless ya get a lemon battery............
 

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That is indeed interesting. I just want to say that one thing troubled me:

"It's what jump-starts the engine so you can get moving. But that's not all it does. It also runs the radio, power windows, stereo, cab lights and the GPS receiver."

This is only true if: The engine is not running, or
the alternator is on the fritz. Once the engine is running, the battery does NOTHING (except soak up juice for awhile from the alternator to put back what is taken out during starting). Only way the battery is called upon to supply energy after the engine is running (assuming the alternator is working properly) is to add more load than the alternator's capacity: the difference is made up by the battery then.
 

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It will probably be tough to beat that deal for a Motorcraft battery. Sometimes the dealership actually has the best deals.... I once bought a set of tires at a Ford dealership.

I usually buy Interstate batteries for my vehicles. Been using them for 30+ years with no problems. I did have one that exploded underneath the hood, but I believe that was due to the voltage regulator malfunctioning and overcharging the battery.
 

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It will probably be tough to beat that deal for a Motorcraft battery. Sometimes the dealership actually has the best deals.... I once bought a set of tires at a Ford dealership.

I usually buy Interstate batteries for my vehicles. Been using them for 30+ years with no problems. I did have one that exploded underneath the hood, but I believe that was due to the voltage regulator malfunctioning and overcharging the battery.
Jeez! And I thought in 60 years of messing with cars, I had about seen it all! I have also heard Interstate is good. Never had one, though.
 

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My truck had a 3 year duralast battery from walmart that lasted 7 years. When it's time for one in the Mustang, that's the route I will take. It's currently got a motorcraft in it from 2014. I just wait till they die before replacing them.
 

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I got 6 years out of my original battery for my Roush. It would’ve probably went longer if I drove the car during the winter. Still have the battery too.


Pick your poison.
 

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The OEM in my 14 just died last month. Replaced with a Costco Duracell. Have them same battery in my Expedition and have had good luck with them.
 

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I would only like to add:
1. Watch that trickle charger. They can overcharge the battery and run them dry.
2. The OEM battery does have a cover you can remove and check the water level. I was surprised how low my water lever was.

I have a 2015 GT too and it gets cold here in PA. I trickle charge my battery to full then pull off the charger. I think I can go another year at least.

I also have replaced batteries using Walmart brand. I was shocked by how long they lasted.
 

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Oem in my ‘12 still. Scurfie has a point, check water if you can and maintain with proper water, keep terminals clean. I use trickle charger once a month only long enough to get the battery to full charge. I’m not an expert battery guy but my batteries seem to last longer than most...that complain on the internet anyway. $50 my battery dies this year, doh!
Seriously OP, if you’re concerned and going into the bush, replace it. I won’t go into the number of new batteries my work place has had to return to Wally World within a year so yeah, I’d recommend not buying from them.
 

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I think 6 years is the most I would go before replacing it, of course, they can go longer but like you I don't want to be stranded. Buy the best battery you can afford if you are going to keep the car, and like someone mentioned heat is the killer of batteries, not cold. In fact, if you want to make the replacement batteries you have at home, for flashlights, smoke detectors, ect. last longer keep them in the refrigerator. The chemical reaction slows down when they are cold.
 

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I replaced the battery in my 2012 last summer. Ford offered 2 different batteries for Mustang. A 7 yr. and a 10 yr. I bought the 7 year for $130 (including installation) with a $20 rebate. If you're worried about it then replace and stick with OEM !!
 

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I'd probalby think about replacing it soon but if its still starting right up and tests fine on a battery tester... that's a judgement call.

Whatever you do, DO NOT get a Wal Mart battery... Just... don't. Interstate and Optima are good but not like they once were.

I'd just get a sealed Napa battery... never had a problem with those ever.
 

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I'd probalby think about replacing it soon but if its still starting right up and tests fine on a battery tester... that's a judgement call.

Whatever you do, DO NOT get a Wal Mart battery... Just... don't. Interstate and Optima are good but not like they once were.

I'd just get a sealed Napa battery... never had a problem with those ever.
 

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In February of 2018 I bought a new battery for my wife's 2011 Mercedes, the battery was still functioning fine, and after a lot of research I bought a Bosch Premium Performance Battery . I paid about $125, on sale, at Pep Boys. I can't remember exactly how I settled on this battery but I'm the kind of guy that will spend time researching anything I buy. I'm sure there are many fine batteries out there but this was my pick.
 
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