CORRECT Battery Group for 2018 OB - Subaru Outback - Subaru Outback Forums
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post #1 of 33 (permalink) Old 05-13-2019, 11:10 PM Thread Starter
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CORRECT Battery Group for 2018 OB

Auto parts store couldn't tell me what battery I needed today, go figure.

I am reading on this forum that it is a 24 or a 34? Which is the OEM? Is it a 24F? Not sure what the F signifies?

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post #2 of 33 (permalink) Old 05-13-2019, 11:26 PM
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OE is Group 25. Group 34 is about 1" longer in length, about the same width, but 1" less height, so it has about the same internal volume. Group 24 is about the same length and width as group 34, but the same height as group 25, so it has the greatest volume of the three, so potentially can have the greatest capacity, all else equal.

Apparently all three will fit into the battery tray of a Gen5 Outback. You may need a spacer under a group 34 battery to make it a little taller so everything fits just right. If you have no unusual requirements, just get a good quality group 25 battery.

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post #3 of 33 (permalink) Old 05-14-2019, 06:44 AM
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I recently replaced the oem group 25 in my '17 OB with a group 24 battery based upon the info in a previous post. Either a group 24 or 34 will be an upgrade from the weak oem battery. I chose the group 24 Walmart Maxx with 770 CCA & 130 reserve min. 3 year replacement & additional 2 year pro rated warranty for $120. It fit perfectly in the battery tray.

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post #4 of 33 (permalink) Old 05-14-2019, 08:35 AM
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Originally Posted by kmc0929 View Post
Auto parts store couldn't tell me what battery I needed today, go figure.
That would cause me to quickly lose all confidence in that auto parts store. Car batteries are pretty basic. Hopefully, you have other auto parts stores in your area that are a little more knowledgeable.

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post #5 of 33 (permalink) Old 05-14-2019, 10:06 AM
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For whatever reason, the '18 and later OBs don't seem to be in the cross-reference lists. Up to '17 is there, but not later. There's probably a sticker on the OE battery that says what its group (or size) number is if you don't want to rely on something someone on the internet told you.

There are several vendors whose group 25 batteries are an upgrade from the stock battery. There's no need to change to a group 34 unless you want to for some reason; some vendors might offer the type of battery you want in 34 but not 25, so that's a good reason to go that route (Optima Yellow Top comes to mind). Group 24 is physically larger, so if you want the extra capacity, that is an option.
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post #6 of 33 (permalink) Old 05-14-2019, 11:38 AM
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For whatever reason, the '18 and later OBs don't seem to be in the cross-reference lists. Up to '17 is there, but not later. There's probably a sticker on the OE battery that says what its group (or size) number is if you don't want to rely on something someone on the internet told you.

There are several vendors whose group 25 batteries are an upgrade from the stock battery. There's no need to change to a group 34 unless you want to for some reason; some vendors might offer the type of battery you want in 34 but not 25, so that's a good reason to go that route (Optima Yellow Top comes to mind). Group 24 is physically larger, so if you want the extra capacity, that is an option.
Speaking of Optima, I've read and heard that they are now owned/manufactured? by another company and that quality is not what it has been. Some reviews are extremely critical. Anyone else have recent experience?
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post #7 of 33 (permalink) Old 05-14-2019, 11:45 AM
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Speaking of Optima, I've read and heard that they are now owned/manufactured? by another company and that quality is not what it has been.
Optima was acquired by Johnson Controls (probably the largest automotive battery manufacturer in the U.S.) in 2000. More recently, I believe the manufacturing plant for Optima batteries has been moved from Colorado to Mexico, but that is unconfirmed. Concerning the product quality trend, all I have seen are scattered anecdotal reports ... both good and bad.

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post #8 of 33 (permalink) Old 05-14-2019, 10:42 PM Thread Starter
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So if I change it to a Group 24 battery, what do I do about the battery wrap / insulation part?
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post #9 of 33 (permalink) Old 05-14-2019, 11:37 PM
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Toss it. It's a piece of cardboard with a strip of foam around the top.
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post #10 of 33 (permalink) Old 05-15-2019, 01:13 PM
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I did notice that searching online for a battery for my 2018 Outback came up blank at several sites. Just confirming that. I was looking because a friend has a 2019 Limited that is about six months old that has succumbed to the dead battery curse at least three times. One suggestion in one of the threads on that issue suggested a larger battery. I think that ignores the larger issue of why this is happening (let's not start that discussion again in this thread), but it did bring me to look at alternative batteries. Thanks for the info here on the groups that will fit my car. I've not had a problem, but I now live out west and hike / camp in some remote areas where a dead battery would be a major issue.


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