Within the past month, I have had to jump start my 2015 Subaru Outback 3.6R twice. The first time it happened was after listening to the radio during my daughter's soccer practice. The second time after unloading/loading up our car during a Fall Break camping trip. (Really? It doesn't take that long to unload/load the car.)
We have had the car about 1.5 years - and loved it. The OEM battery has 490 CCA (cold cranking amps) and is Group 25 size.
After reviewing several other threads on this forum, I decided to try a Group 34/78 size battery since the dimensions are very close to the Group 25 size.
I went to our local O'Reilly's Auto Parts store, and worked with Adam. He was great - very helpful. Here is what we found out.
I decided to try the Optima Yellowtop 34/78 AGM battery. It provides 750 CCA's and has a C20 capacity of 55 Ah. (For comparison purposes the Optima Redtop 25 battery provides 720 CCA's and has a C20 capacity of 44 Ah.) It is originally configured with top posts, but can be changed to side posts if necessary. We also discovered that this is a "multi-group" size battery. In other words, the Optima 34/78 battery includes several adapters so it will mimic a Group 24/27, Group 48, Group 65, and Group 78 size of batteries.
After taking out the OEM Group 25 size battery, we noticed that the battery tray where the battery sits is very large. Then, we placed the two batteries on the sidewalk side-by-side. They were nearly identical in length and width with the Optima battery just a little bit shorter. Consequently, we decided to use the height adapter.
We put the new Optima battery on the tray and placed the hold-down bracket on top of the battery and tightened everything down - no problem. Then we checked for height clearance - no problem. Closed the hood, and started the engine - no problem.
So, the takeaway? An Optima Yellowtop 34/78 size battery fits just fine in a 2015 Subaru Outback 3.6R.
Hope this helps.
We have had the car about 1.5 years - and loved it. The OEM battery has 490 CCA (cold cranking amps) and is Group 25 size.
After reviewing several other threads on this forum, I decided to try a Group 34/78 size battery since the dimensions are very close to the Group 25 size.
I went to our local O'Reilly's Auto Parts store, and worked with Adam. He was great - very helpful. Here is what we found out.
I decided to try the Optima Yellowtop 34/78 AGM battery. It provides 750 CCA's and has a C20 capacity of 55 Ah. (For comparison purposes the Optima Redtop 25 battery provides 720 CCA's and has a C20 capacity of 44 Ah.) It is originally configured with top posts, but can be changed to side posts if necessary. We also discovered that this is a "multi-group" size battery. In other words, the Optima 34/78 battery includes several adapters so it will mimic a Group 24/27, Group 48, Group 65, and Group 78 size of batteries.
After taking out the OEM Group 25 size battery, we noticed that the battery tray where the battery sits is very large. Then, we placed the two batteries on the sidewalk side-by-side. They were nearly identical in length and width with the Optima battery just a little bit shorter. Consequently, we decided to use the height adapter.
We put the new Optima battery on the tray and placed the hold-down bracket on top of the battery and tightened everything down - no problem. Then we checked for height clearance - no problem. Closed the hood, and started the engine - no problem.
So, the takeaway? An Optima Yellowtop 34/78 size battery fits just fine in a 2015 Subaru Outback 3.6R.
Hope this helps.
