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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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2013 3.6R Limited
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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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2010 Subaru Outback 2.5i Limited
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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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2009 3.0R Outback
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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?

Sent from my Pixel 3 using Tapatalk
 

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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.

Sent from my Pixel 3 using Tapatalk
 

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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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