Stock battery size is Group 35, however others on here state the Group 24F will fit and I have to wonder if that's what your looking at?

 

Group 35 Battery from NAPA is 1/2 inch longer than the OEM battery in my 2015 Forester. My 2015 is a Limited with CVT transmission.

 

Group 35. Just replaced the battery in thr 2019 crosstrek with a costco group 35. It weird had a h5(47) battery in it before?

 

beware things like I had happen at Costco - the guy was sure I needed Group "x" (whatever it was) which was exactly the same dimensions as the correct battery for my '17, but the + and - poles are reversed so the harnesses won't reach. I had to deal with this at the peak of 2020 pandemic panic, and I had forgotten to unblock my other car, trapped in the garage by my disassembled Subaru.

 

Unfortunately, battery sizes are a 'horse shoes and hand grenades' topic. Close is typically good enough.

A big part of the problem is that the vehicle comes from Japan with a JIS sized battery. Our similar 2018 Forester came with a Panasonic 75D23L.

In North America we use BCI sizing, and the closest equivalent in dimensions and terminal position is the Group 35. I purchased a Walmart Everstart Maxx and it fit just fine. The fractional difference didn't seem to be a real issue when I did it two years ago. The tray and hold-down hardware could have accommodated something even larger.

BE VERY CAREFUL WITH STRESSING THE SENSING HARDWARE ON THE TERMINALS. I ran into a fuse block on the +, voltage/current/temperature sensor on the -. There are TSB's and pages of instructions in the manual about not twisting or overtightening them. Less is more.

 

....and buy the AGM( What I meant, but typed gell cell) battery so as to have much less terminal corrosion problems ime. I modified the factory hold down on myh 2015 and welded up a new and much better hold down for my 2010.

 

The "gel cells" are called AGM (absorbed glass mat) which requires no cell water addition maintenance and like @Natedog said, also have the benefit of eliminating the external maintenance of corrosion on the terminals and wiring. The same group size should fit like the "regular" flooded battery you already have.

The only downside is that they are a bit more expensive but they often come with a longer warranty because they also tend to last longer..

 

The "gel cells" are called AGM (absorbed glass mat)

No. Gel cells and AGMs are batteries with different ways of handling the electrolyte.

Quick search:

What is the difference between AGM and Gel batteries?

We'll explain the difference between Gel and AGM batteries in the Power Source blog

www.optimabatteries.com

 

Go get an Interstate Group 35 from Costco. Install. Be happy.

I replaced the original battery in my 2017 back in 2022 in this exact fashion, zero issues in terms of fitment or performance. Buying the $129-out-the-door battery from Costco was $50 cheaper than the next option locally.

 

Go get an Interstate Group 35 from Costco. Install. Be happy.

I replaced the original battery in my 2017 back in 2022 in this exact fashion, zero issues in terms of fitment or performance. Buying the $129-out-the-door battery from Costco was $50 cheaper than the next option locally.

View attachment 592306

Thanks for the advice. But...
Round Trip Distance to nearest Costco = ~200 miles
Round Trip Distance to nearest Walmart = ~130 miles
Round Trip Distance to nearest NAPA = ~16 miles

 

Thanks for the correction, but I doubt that many people would be confused.
Per the above link, I'm thinking since it "really doesn't matter for the vast majority of folks who use lead-acid batteries, because they'll probably never see or use a gel battery in their car or boat", @Natedog likely meant AGM, as gel batteries aren't commonly (ever?) used in a automotive applications as their cost does not outweigh their benefits, unlike AGMs. IMHO

 

Enough people get confused that various battery manufacturers put the info in their FAQs. Whether or not it matters, well, you can call something racing fuel but people will probably never see or use racing fuel in their car or boat.

While we do see mostly flooded and AGM batteries, there are gels out there. Maybe not as many today. I left the industry before 2010. My background is (was) design/manufacture of computer controlled inverters and battery chargers.

 

Point is gels aren't sold as car batteries, because they are designed for, and typically used in low ventilation, deep cycle requirement environments.
They are also quite expensive compared to the commonly available AGM or FLA types, which would likely get a "you don't need that battery under your hood" comment from a salesperson.

 

Point is

My point was only that gels and AGMs are different types of batteries, and it is incorrect to say that they are the same thing. Yes they are most commonly used as house batteries. (Lingo warning: House batteries, not necessarily batteries in your house.)

 

@Ralph_Thornton,
Yes, the Group 35 fits in just fine. I just replaced mine with an Interstate battery. 2015 Forester

 

Yes, the Group 35 fits in just fine. I just replaced mine with an Interstate battery. 2015 Forester

Thanks Tane. I installed a new NAPA battery with 640 Cold Cranking Amps this morning. All is Good.

 

Edited above as I meant AGM, many other stores and online sell and ship AGM besides just Costco.

 

@Ralph_Thornton,

That question should be easy ... with a flashlight ... and a good pair of Glasses ...... ;

I went from OEM Stock lawn-mower-battery to a 900-CCA ... all by visual verification.

 

I had the Group 35 AGM for our 2017 shipped, mainly because no one local had one in AGM.

16 miles round trip to go pick it up, AGM or not, without having to wait a day or two usually wins out for me, unless you can get a smoking deal online with free shipping.

Not to mention returns (if needed) are a lot less complicated on something like that, especially if you don't have Amazon Prime.

 

AGM Batteries should require a different Charging Program than a Flooded-Cell Lead-Acid battery ......

 

Thanks everyone for the comments. I installed a new NAPA battery with 640 Cold Cranking Amps into my 2015 Forester Limited this morning. All is Good.

 

A Walmart EverStart MAXX34n will get you 800-cca ; and it still leaves room enough for the new battery to move around about 1-inch in the battery tray .... Not sure if there is an even bigger battery !!!!
But to those who tried to tell all of us several years ago that "X" , "Y" , and "Z" were all reasons to not ever touch your battery ............... : pppphhttttttttttttttttttttt !

 

I’m coveting the Odyssey Group 35 AGM.
$350!

 

Just in case no one else noticed, the OP has already acquired and installed a battery replacement in his vehicle as noted in Post #25, so I doubt recommending an alternative, at this point, will inspire him to replace it..

 

^ Indeed - the thread title does say "Solved"

 

Touche'

 

@Ralph_Thornton I have adjusted your signature; pls update it if you no longer have the 2007 thanks