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When to replace a battery? #5283376 12/02/19 08:14 PM
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Chris142 Offline OP
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I went and had a complete charging system test done on my Jeep. It's all working as it should. The tester showed that my battery was fully charged but only had 80% of its rated capacity.

At what percentage of capacity loss should a battery be replaced?


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: When to replace a battery? [Re: Chris142] #5283384 12/02/19 08:24 PM
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KGMtech Offline
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This is not a technical answer, but I shop for a replacement battery before I need one. I think anything over 5-6 years is asking for trouble, besides, if you stretch the old battery too far it will put extra strain on your charging system.


2017.5 Nissan Rogue SV FWD
2013 Nissan Maxima SV
2009 Ford Flex SEL FWD
1984 Yamaha XJ750RL
Re: When to replace a battery? [Re: Chris142] #5283386 12/02/19 08:24 PM
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JeffKeryk Offline
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I kinda go by time. After 5 years, I keep an eye out for drag...
The factory battery in my old 93 Toyota 4WD 22RE lasted more than 10 years.

If you see signs of trouble, I would replace it to avoid getting stuck.
Especially if it was wifey's car.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
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2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: When to replace a battery? [Re: JeffKeryk] #5283394 12/02/19 08:35 PM
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bbhero Offline
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Agree 100 percent ^^^^^^

Especially the lady's car part has well.


Nissan Altima 3.5 Coupe
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"Treat your family like your friends and treat your friends like your family."
Re: When to replace a battery? [Re: Chris142] #5283399 12/02/19 08:37 PM
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Chris142 Offline OP
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It's 3 years old and in my Jeep.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: When to replace a battery? [Re: JeffKeryk] #5283416 12/02/19 08:50 PM
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Wolf359 Offline
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Originally Posted by JeffKeryk
I kinda go by time. After 5 years, I keep an eye out for drag...
The factory battery in my old 93 Toyota 4WD 22RE lasted more than 10 years.

If you see signs of trouble, I would replace it to avoid getting stuck.
Especially if it was wifey's car.


Well I've got a 12 year old AGM battery. I check the voltage, it's been about the same as last year. Could have gotten a Champion battery on Black Friday at Pepboys, I guess I'll wait another year or so...

Re: When to replace a battery? [Re: Chris142] #5283425 12/02/19 08:57 PM
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69GTX Offline
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I went 3 yrs on a battery similar to yours....total of 6 yrs. At the 3 yr point it had fluid level well below the cell tops and lots of sulfation. Was lucky to bring it back with a lot of charging. 6 yrs total was fine with me. I replaced it once it acted up again. I'm sure the capacity was never near 100% after is run down so low. You need enough capacity to start the car in cold weather. California is pretty temperate. But then again, batteries tend not to last near as long in hot desert climates.

Last edited by 69GTX; 12/02/19 09:00 PM.

----------------

2001 Lincoln Cont 4.6L DOHC/ 50K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: When to replace a battery? [Re: Chris142] #5283437 12/02/19 09:09 PM
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rubberchicken Offline
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Optima Red Top battery in my 1997 Suburban 2500. Manufactured in 2004, still running strong.

Re: When to replace a battery? [Re: Wolf359] #5283444 12/02/19 09:15 PM
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bbhero Offline
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That vehicle has that battery in the trunk too....

Extremely helpful to battery lasting a long, long time.
Vs having the battery in the motor compartment with all that heat exposure.


Nissan Altima 3.5 Coupe
Cam2 full synthetic 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: When to replace a battery? [Re: Chris142] #5283446 12/02/19 09:17 PM
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bbhero Offline
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Originally Posted by Chris142
I went and had a complete charging system test done on my Jeep. It's all working as it should. The tester showed that my battery was fully charged but only had 80% of its rated capacity.

At what percentage of capacity loss should a battery be replaced?

I believe that if it drops below 70% of rated capacity then it's time to replace the battery... Maybe as low as 60 percent...


Nissan Altima 3.5 Coupe
Cam2 full synthetic 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: When to replace a battery? [Re: Chris142] #5283450 12/02/19 09:29 PM
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volk06 Offline
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My 2011 F150 still has the factory battery and is going strong. Just tested it this weekend, read 12.4v and 800 cranking amps when it was tested.

Wish I could find a aftermarket battery as reliable as that.

Re: When to replace a battery? [Re: Chris142] #5283454 12/02/19 09:38 PM
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bilibako2 Offline
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I replaced our car's battery every 4 years.Costco battery most of the time.


bentoti/1999
Re: When to replace a battery? [Re: Chris142] #5283459 12/02/19 09:41 PM
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Fawteen Offline
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I go 4-5 years on a battery and replace it. I've never had one fail, never needed a set of jumper cables, and it has never left either me or my wife stranded.

Re: When to replace a battery? [Re: Chris142] #5283463 12/02/19 09:47 PM
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I replace the battery when I notice it getting sluggish.


2010 Honda Civic LX
Valvoline SynPower 5w-20 - Napa Gold oil filter
59,992 miles
Re: When to replace a battery? [Re: Chris142] #5283472 12/02/19 10:06 PM
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Donald Offline
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Originally Posted by Chris142
I went and had a complete charging system test done on my Jeep. It's all working as it should. The tester showed that my battery was fully charged but only had 80% of its rated capacity.

At what percentage of capacity loss should a battery be replaced?


At 80% you are fine. You are not in Maine where the temps get really low and battery capacity is reduced.

At 60% I would start to think. At 50% I would definitely get a new one.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
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