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Old 01-21-2017, 02:41 PM   #1
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Focus Battery Life

I have been looking through the threads and have seen a wide range of battery life people are getting. I have a Mk3 with a build date of August 2011. It has just over 80k miles. I have been monitoring the battery/charge voltage with one of those cigarette lighter units. Voltage when I get in before starting is around 12 or a little less. When driving it reads around 14.7. I am not noticing any issues, but wonder if I should be proactive and change the battery before it just up and dies.


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Old 01-21-2017, 02:58 PM   #2
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14-15v on run is normal, if its 14.6 and up it usually means its trying to charge the battery quicker..
average life i find depends on the type and make of the battery in question as mentioned in other threads ive seen batteries last 4-7 years on average but i find they are bargain basement batteries you buy at corner autostores.. the factory batteries i see last 7+ years but it also depends on how much the car is driven, how long it sits and climate its in.. problem is voltage doesn't always mean good battery i have a few batteries that show 11.5-12.3v but barely start a lawnmower and wont start a car. its all dependent on the condition of the internal plates corrosion and swelling.
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Old 01-21-2017, 03:54 PM   #3
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And a load test of the battery is the only way to tell if it's getting near the end of it's dependable lifespan - before you have issues with slow cranking/not starting.
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Old 01-21-2017, 03:56 PM   #4
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Quote:
Originally Posted by sailor View Post
And a load test of the battery is the only way to tell if it's getting near the end of it's dependable lifespan - before you have issues with slow cranking/not starting.
I actually forgot about that... -.-''' i got so used to my battery charger having one built in to it so i never owned a separate handheld.
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Old 01-21-2017, 04:01 PM   #5
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^^^That's handy as can be, it's dramatic when you see the voltage drop from load on an old battery.
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Old 01-21-2017, 04:11 PM   #6
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Mine, recently blew (literally) at 58k miles. Cracked around the negative terminal and spewed battery acid all over underneath of the battery. Basically worst case scenario for a battery. New one cost me $125 from the dealership, installed. Cleaning, sanding, painting the mess will be on me.
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Old 01-21-2017, 04:25 PM   #7
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Mine has 3 needle sweep meters and 4 lights if it blinks red it means the battery is shot. xD yellow is charging green is charged and orange is power (the orange hasn't working in years the bulb is shot and never bothered replacing it as you know when its on it hums like no tomorrow)

like Juicedz they can fail anytime they are consumables they can last for years they can last for months. there's so many factors no point describing I'd be here all day
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Old 01-21-2017, 07:03 PM   #8
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since you have a lighter socket voltage meter dont worry to much if your driving and the voltage reads 12.2v for a while this is normal with fords smart charging the battery only really gets charged to about 80% to prolong the life
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Old 01-21-2017, 07:09 PM   #9
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ok thats new never knew ford installed smartcharger PCM controlled alternators.. of course my newest is an 06 so it doesn't have it..
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Old 01-22-2017, 04:51 PM   #10
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Get a trickle charger and once a week charge it up. I've been doing it for years with all my vehicles. The motorcycles get rotated m-f and my car gets it Saturday night and wife's gets it on Sunday night. I've only ever had one battery failure and it was from the 2006 focus and 2 years in it started puking acid due to a crack. Replaced under warranty. Then drove it another 130k over 7 years without so much as a long crank before it met its death in a collapsed road filled with water.
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