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Re: When to replace a battery? [Re: Chris142] #5283817 12/03/19 10:04 AM
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Dwight_Frye Offline
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I have had several batteries fail at between the 4 and 5 year mark and the last one, which had a 60 month warranty failed after only 3 years. In each case they only gave one slow cranking warning before complete failure requiring a jump start to get to the auto parts store for a new battery.
I am now in the habit of just buying a new one every 4 years and swapping it out before I have any problems. I live in SouCal and i think the heat kills them or at least is very hard on batteries, regardless of whether they are 48 month or 84 month guaranteed. I think the only thing a longer warranty gives you is more pro-rated credit when they fail after 4 years.

Re: When to replace a battery? [Re: Chris142] #5283825 12/03/19 10:09 AM
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ZZman Offline
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When the capacity is too low to start the vehicle!


2007 Hyundai Santa Fe AWD.
2005 Toyota Avalon XLS
Re: When to replace a battery? [Re: Kira] #5283845 12/03/19 10:32 AM
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Originally Posted by Kira
'Twas the aircraft mechanic next door during my childhood who I can remember hearing say, "After 3 years a battery doesn't owe you a thing".

And that was long before the era of constant computer drain in cars.

I kick myself for not picking up that Snap-On pile battery tester at that garage sale.....it was $5.


The least I remember getting out of a battery (based on the date on it) is 5 years, but then I realized I let the water get low in a couple of cells. I have gotten 10 out of a couple. But my cars don't have computer drain. (No computer at all).


84 Olds Cutlass - 350 Olds
83 Chevy Caprice - 305 Sbc
79 Honda CX500
Re: When to replace a battery? [Re: Chris142] #5283858 12/03/19 10:47 AM
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I'm pretty aware of when a start is sluggish on my truck. I've owned my 2002 Tacoma since new and it is still my daily driver. Once I detect that, I'm replacing it. I just looked at my maintenance spreadsheet and my Walmart batteries last me around 4 years. And I'm right at 4 years now. :-/ I guess I'll be listening extra close every time I start my truck now.

Question: are AGM batteries worth it in this sort of application?


02 Tacoma 3.4L, 233K, Hav ProDS 10W30 (me)
12 Highlander 3.5L, 115K, Napa Syn 0W20 (wife)
17 Escape 2.0L, 53K, P66 Shield Choice SynBlend 5W30 (son)
Re: When to replace a battery? [Re: mrdctaylor] #5283871 12/03/19 10:55 AM
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PowerSurge Offline
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Originally Posted by mrdctaylor
I'm pretty aware of when a start is sluggish on my truck. I've owned my 2002 Tacoma since new and it is still my daily driver. Once I detect that, I'm replacing it. I just looked at my maintenance spreadsheet and my Walmart batteries last me around 4 years. And I'm right at 4 years now. :-/ I guess I'll be listening extra close every time I start my truck now.

Question: are AGM batteries worth it in this sort of application?


You’re better off with a FLA (Flooded Lead Acid) in Texas.

Re: When to replace a battery? [Re: PowerSurge] #5283877 12/03/19 10:57 AM
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Originally Posted by PowerSurge
You’re better off with a FLA (Flooded Lead Acid) in Texas.


Oh? Ok--good to know. Why is that?


02 Tacoma 3.4L, 233K, Hav ProDS 10W30 (me)
12 Highlander 3.5L, 115K, Napa Syn 0W20 (wife)
17 Escape 2.0L, 53K, P66 Shield Choice SynBlend 5W30 (son)
Re: When to replace a battery? [Re: mrdctaylor] #5283888 12/03/19 11:08 AM
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Chris142 Offline OP
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Originally Posted by mrdctaylor
Originally Posted by PowerSurge
You’re better off with a FLA (Flooded Lead Acid) in Texas.


Oh? Ok--good to know. Why is that?

Some people say that AGM batteries don't like heat. My exide orbital lasted 90 months and my optima lasted 84 and I live in the desert.


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: DzoG20] #5283889 12/03/19 11:10 AM
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Chris142 Offline OP
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Originally Posted by DzoG20
Originally Posted by Chris142
The tester showed that my battery was fully charged but only had 80% of its rated capacity.


Do you mean 80% of the CCA rating or Reserve capacity ?

My 3 years old OE panasonic battery showed the spec CCA on the test(at AA) but turned out it had only about 10% of the reserve capacity left.
Car was starting fine with fully charged battery, but after some headlights testing on the battery alone(don't ask ...) - it did not start, almost not turning at all the 2.0L engine. Got it completely charged on 1A charger for only 5h (spec is 60Ah) and the car started without a hiccup. One hour later this battery was on the recycle pile.

80% of its CCA. Rated @775 but puts out 620.


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: mrdctaylor] #5283897 12/03/19 11:20 AM
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PowerSurge Offline
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Originally Posted by mrdctaylor
Originally Posted by PowerSurge
You’re better off with a FLA (Flooded Lead Acid) in Texas.


Oh? Ok--good to know. Why is that?


“But even AGM batteries face challenges. “AGM batteries will perform well in the heat, but the life span will be hampered due to loss of water from the high temperatures,” says Jeff Barron, research lab manager for Interstate Batteries”

https://www.consumerreports.org/car...ts-your-car-battery-what-to-do-about-it/

Last edited by PowerSurge; 12/03/19 11:21 AM.
Re: When to replace a battery? [Re: JohnnyJohnson] #5283938 12/03/19 12:01 PM
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supton Offline
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I usually go until it needs jumping. A jump or two later I'm at Walmart to get a replacement.

I did notice the wife's car starting slower one winter, so the following fall I proactively replaced it. 5 years isn't a bad run. I am pretty sure she can use jumper cables but I'm not sure she wants to.

My truck has been cranking slower in the cold weather. For the last couple of years! It's going on 10 years old but still goes. All three vehicles take the same size battery, so (in theory) could just swap if I needed to. I keep thinking about changing it but part of me wants to eek out the very last--why I don't know. Probably because no replacement battery will last as long, I guess.

Originally Posted by JohnnyJohnson
When the battery reaches it months of service date. On my Corolla it was 84 months the battery had passed that date by 5 months and winter was coming. I replaced it then even though I hadn't had problem one with it.

Service date? You mean when it reaches end of warranty?


2011 Toyota Camry, base, 2.5L/6MT, 201k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 157k, ours
1999 Toyota Camry LE, 2.2L/4AT, 223k, his
Re: When to replace a battery? [Re: PowerSurge] #5283975 12/03/19 12:47 PM
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Originally Posted by PowerSurge
Originally Posted by mrdctaylor
Originally Posted by PowerSurge
You’re better off with a FLA (Flooded Lead Acid) in Texas.


Oh? Ok--good to know. Why is that?


“But even AGM batteries face challenges. “AGM batteries will perform well in the heat, but the life span will be hampered due to loss of water from the high temperatures,” says Jeff Barron, research lab manager for Interstate Batteries”

https://www.consumerreports.org/car...ts-your-car-battery-what-to-do-about-it/


Well, here's a quote 2 paragraphs prior:

"If you live in an area with extreme temperatures, and are looking for a maintenance-free battery, consider getting an AGM. While AGM batteries can also be affected by high heat, they tend to perform better overall than other sealed batteries in our tests."

Last edited by mrdctaylor; 12/03/19 12:48 PM.

02 Tacoma 3.4L, 233K, Hav ProDS 10W30 (me)
12 Highlander 3.5L, 115K, Napa Syn 0W20 (wife)
17 Escape 2.0L, 53K, P66 Shield Choice SynBlend 5W30 (son)
Re: When to replace a battery? [Re: mrdctaylor] #5283977 12/03/19 12:48 PM
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kschachn Online Content
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I saw that too, seemed like a bit of selective quoting by PowerSurge.

Everything I've read on the Internet (where all of this information seems to come from) says that AGM batteries are better for warm and hot climates.


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Re: When to replace a battery? [Re: PowerSurge] #5284069 12/03/19 02:46 PM
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Originally Posted by PowerSurge
Originally Posted by atikovi
Run it till it dies and keep a jump box in the trunk for when it does.


Then you take the chance on being stranded. I have jump starters in my vehicles but I don’t rely on them to keep me from getting stranded. Those things die all the time. I’d rather spend the money than go cheap and have my day ruined. It also puts more strain on the starter motor when it’s running at a reduced voltage.


The cheap ones yes, but get a good one and no problem.

Re: When to replace a battery? [Re: painfx] #5284470 12/03/19 09:29 PM
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Originally Posted by painfx
Rule of thumb is to replace every 4 years. That is what I do.

As for battery testing and inspection, check for signs of corrosion. Do a battery load test with a carbon pile VAT 40 or some that can apply a load , anything over 10 Volts is consider good.

Or you can just disable the fuel or ignition, crank the vehicle and measure voltage should be above 10 volts is consider good.


Why rely on a rule of thumb when you can just get it load tested and know for sure?

Why guess when you can know for sure?

Re: When to replace a battery? [Re: Wolf359] #5284934 12/04/19 12:47 PM
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Originally Posted by Wolf359
Originally Posted by painfx
Rule of thumb is to replace every 4 years. That is what I do.

As for battery testing and inspection, check for signs of corrosion. Do a battery load test with a carbon pile VAT 40 or some that can apply a load , anything over 10 Volts is consider good.

Or you can just disable the fuel or ignition, crank the vehicle and measure voltage should be above 10 volts is consider good.


Why rely on a rule of thumb when you can just get it load tested and know for sure?

Why guess when you can know for sure?


Exactly. Hence, I did listed the steps

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