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1 agm battery vs 2 x lead acid whats the better buy? #5438687 05/25/20 06:08 PM
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apollo18 Offline OP
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hey guys im going to be replacing my vehicle battery soon and here in canada, its harder to find batteries and we dont get them that cheap.
pushing warranty aside, i can either get 2 x costco lead acid batteries meaning when 1 fails i can just buy another one for about the same money as buying 1 energizer agm battery.

do you think an energizer agm battery can last 2 x more?
i feel like its a no brainer to save the extra money and keep buying lead acids since the agm is 2x the cost

this is keeping warranty aside as they both have similar warranty thru costco. so i just want to compare the product.

correct me if im wrong
thx

Last edited by apollo18; 05/25/20 06:21 PM.
Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5438704 05/25/20 06:33 PM
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CT8 Offline
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Quaker State Ultimate Durability is a real good oil.


2015 F150 2.7
2018 F350 6.2
Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5438708 05/25/20 06:37 PM
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Pelican Offline
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If you tell us the year and brand of vehicle it's going on we'll be better able to help you.

Last edited by Pelican; 05/25/20 06:39 PM.
Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5438712 05/25/20 06:43 PM
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eljefino Offline
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Does it get real cold there? Does the AGM have an advantage in cold cranking that you could use?

Would you feel funny pushing the AGM into year 10 or whatever your goal is, or would you chicken out and replace it anyway?

Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: Pelican] #5438735 05/25/20 07:05 PM
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apollo18 Offline OP
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2003 hummer h2!

Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: eljefino] #5438738 05/25/20 07:08 PM
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apollo18 Offline OP
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Originally Posted by eljefino
Does it get real cold there? Does the AGM have an advantage in cold cranking that you could use?

Would you feel funny pushing the AGM into year 10 or whatever your goal is, or would you chicken out and replace it anyway?



yeah in winters it gets really cold -40 celcius basically
but you are right i guess i wouldnt want to keep an agm into year 10 unless that is normal life expectnacy for an agm which i dont believe it is

i am heavily leaning towards getting a lead acid, seems lile its going to be a better buy and with costco i can just replace it in 4 years regardless. they are great with warranty. and tbh this vehicle probably wont even be driven that much after the next couple years so not sure if that would affect anything

Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: CT8] #5438740 05/25/20 07:10 PM
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Ram02 Offline
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Originally Posted by CT8
Quaker State Ultimate Durability is a real good oil.



Indeed it is


2013 Malibu 2LT M1 5w30
2013 Accord Sport M1 AP 0w20
Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5438811 05/25/20 08:38 PM
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Wolf359 Offline
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Originally Posted by apollo18
Originally Posted by eljefino
Does it get real cold there? Does the AGM have an advantage in cold cranking that you could use?

Would you feel funny pushing the AGM into year 10 or whatever your goal is, or would you chicken out and replace it anyway?



yeah in winters it gets really cold -40 celcius basically
but you are right i guess i wouldnt want to keep an agm into year 10 unless that is normal life expectnacy for an agm which i dont believe it is

i am heavily leaning towards getting a lead acid, seems lile its going to be a better buy and with costco i can just replace it in 4 years regardless. they are great with warranty. and tbh this vehicle probably wont even be driven that much after the next couple years so not sure if that would affect anything


Not sure where your battery is. Mine is in the trunk and it's an original factory AGM battery that's 12 years old. It's a JCI battery. In the US it's a no brainer to get an AGM because it's only around 20% more for the AGM, not 100%. Plus Pepboys tends to have good rebates so if you catch it on sale, it's almost as cheap as a regular battery. In your situation, I would just get a regular JCI lead acid battery.

Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5438872 05/25/20 10:01 PM
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Kira Offline
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It's a comfort to know that a battery's discount price can effect a sale on either side of the border.

Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5438909 05/25/20 11:48 PM
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The Critic Offline
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Unless your application requires AGM, you are much better off with buying two conventional lead acid batteries.


2020 Ram 1500 5.7L eTorque - <1K - Factory Fill
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Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5439048 05/26/20 06:57 AM
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BMWTurboDzl Offline
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Lead acid and trickle charger.


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5439083 05/26/20 07:35 AM
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Cujet Offline
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All lead acid batteries degrade over time. As most of us know, properly cared for conventional batteries may have wildly varying lifespans. Some of that may be due to build quality and material quality. The latest Costco battery I have in my 2009 F150 in FL has held up well at 4 years now, that truck kills batteries, often 1.5-2 years. Each cycle was different...

AGM's are said to have twice the lifespan. However, it's good to remember that while they still work and are not as likely to suddenly fail (due to construction) , AGM battery capacity degrades just like any lead acid battery. An old AGM won't have a lot of reserve power.

Our 2 year old Concorde AGM's on our PC-12 aircraft, just tested at 94% and 91% of rated AH capacity. But remember those batteries tested at 130% or more when new. (last year they tested over 100%) So they sandbag, to make the batteries seem to last longer. Degradation over 2 years is over 30%. Next year, they will test below 80% (the limit) and will be discarded.


Let's put that another way, after 3 years, each of those $4000 super high quality AGM's will have 62% of original capacity. That's the reality of lead acid batteries. It's also good to note that chinese flooded lead acid car batteries are known to have very short lives.

Last edited by Cujet; 05/26/20 07:40 AM.

People who count on their fingers should maintain a discreet silence.
Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5443313 05/31/20 03:55 PM
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It depends on a couple of things. A lead acid battery needs to be fully charged at least once a year. Otherwise it will degrade quickly. It can't be fully charged at 14.4 volts what most cars have. An AGM battery can be fully charged at 14.4 volts. It just takes long time. Another factor to consider - the voltage your alternator provides. If it is 14.0 V or lower than a lead acid battery won't last long. 3-4 years max. You need to charge them manually at least twice a year to keep them alive. So if you can recharge the batteries regularly than a lead acid battery is your choice. If you want to buy and forget for a number of years than an AGM battery may outlast 2 or even 3 lead acid batteries.


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Re: 1 agm battery vs 2 x lead acid whats the better buy? [Re: apollo18] #5446562 06/05/20 02:35 AM
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bonjo Offline
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AGM is more resitant to vibration, is leakproof, can deliver higher CCA, lower discharge rate and no gasing. But the charging voltage is higher otherwise, you never fully charge the battery. And you can mount them in any orientation.

It is also more expensive.

Either typre needs charging once a month when in storage unless they have not been activated

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