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The local Pep Boys has a Champion-brand AGM battery in stock that's group 25. Is there any reason why I shouldn't get that? Champion AGM Battery, Group Size 25 | 2071655 | Pep Boys

There's also an Optima RedTop 25 for $80 more. What would I be getting for the price difference?
 

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I installed that same Champion AGM battery in my 2013 3.6R last August. Bought it on sale at my local Pep Boys for $147. 4-year full-replacement warranty. It has performed exactly as designed thus far.
 

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Just installed an EverStart Maxx size 24f from Walmart in my 2010 Outback yesterday. Fits just fine. I would opt for the one with the reversed poles however, as the battery is quite difficult to reach with the terminals. I believe this is the largest that will fit in a gen 4 Outback. May be wrong, though.
 

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That would be a group 24 vice a 24F.
Technically correct, though a 24F is slightly larger in length and height than the 24. I was, however, unaware that the direct reverse of the 24 is the 24F (or 24R). Thanks for the info. Nonetheless, I was able to make the 24F work in mine. As far as I know, it should be the largest battery available that will fit (at least when keeping the battery tray).
 

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That's a pretty good deal for the Champion AGM size 24. Wish I had the money right now. I have an Optima yellow top that's not even 4 years old, but it got neglected by sitting in a car unused for nearly a year so it's not too healthy at this point.
 

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Went to get a new battery at Napa, they were trying to tell me that putting a AGM battery in a car that was not factory with one would cause issues.

Has anyone had issues with switching to AGM?

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I installed a Champion AGM battery purchased on sale at Pep Boys last August. No issues whatsoever and all the electrical functions (such as the window operation) are crisper and faster. Those NAPA employees need some battery educational training.
 

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I installed a Champion AGM battery purchased on sale at Pep Boys last August. No issues whatsoever and all the electrical functions (such as the window operation) are crisper and faster. Those NAPA employees need some battery educational training.
That's what I thought, I could see potential issues if I dropped it in my 30 year old Ford maybe.

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This is relevant although I'm unsure it can be shipped cause China but I installed a Kepworth 60ah LiFePO4 1100cca in my Forester. I run a diode to increase voltage by +0.5. Running the previous battery my voltage fluctuated between 12.3-15.2. The Kepworth keeps my voltage between 13.2-14.6. Tighter voltage!
Edit: the Kepworth only weighs 7lbs.
 

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I ended up with the Champion AGM I mentioned above. It's been fine for a few weeks.
 
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I have the 4 cylinder 2012.. what is the consensus on the battery? Use a 24 or the 34? It possible to have too much power in the battery? I am considering the AGM . I have the 2.5 premium pckg 2012 outback..
Thanks for any responses..


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The default on the Outback for this gen is a Group 25: Group 24 reverses the polarity. The Champion AGM Group 25 mentioned above has been fine since late June, but I've also been careful to drive the car at least briefly once a week. We have a 2013 Limited with the 2.5L 4 cyl.
 
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I left a map light on overnight, AP fired up, 14v.
Mind saying what you paid for that Kepworth? It's currently unavailable from Amazon and I can't find it for sale anywhere else. From what little I know about those type of batteries, it had to have cost $600+.

Also, do you live in a cold climate? If so, how do you overcome the fact the battery can't take a charge at below freezing temps without damaging it? The Amazon description doesn't state whether the BMS has a low temp cut-off or not.
 

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I don't remember exactly, but it was under $360 shipped. It was purchased on alibaba dotcom.
For freezing temps, it's my understanding you need to draw current. Like, turn on your headlights for 3-5 minutes.

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Edit: I live in Phoenix. Also, Kepworth offers batteries much smaller than the one I use. You could probably get away with a 20ah battery. I think they spec 550 cca. All of the 12v auto batteries come with built in bms.
 

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It possible to have too much power in the battery?
You can have too much Voltage (all cars use 12 Volt batteries which should have around 12.6 Volts when fully charged and usually around 13.2 (or a bit more) Volts when charging) If the Voltage drops too low you will notice because funny things start to happen with the electronics but usually no permanent damage is done. If the Voltage were too hi damage could occur. You can't have too much capacity (i.e. Ampere hours or cold starting Amps.)
 

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Group 34 AGM battery has far more CCA than a group 25 battery and fits the foam insulation jacket.
 

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You can have too much Voltage (all cars use 12 Volt batteries which should have around 12.6 Volts when fully charged and usually around 13.2 (or a bit more) Volts when charging) If the Voltage drops too low you will notice because funny things start to happen with the electronics but usually no permanent damage is done. If the Voltage were too hi damage could occur. You can't have too much capacity (i.e. Ampere hours or cold starting Amps.)
Thanks, I should have been more clear, can you have too much capacity...
So the grp 34 fits the jacket, but the 24F fits the tray better from what I’m reading??
Thanks


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