pretty sure east penn/DEKA makes O'reilly's batteries. I've had 2 so far and they are excellent if a little pricey. Close to zero corrosion as they are well sealed/carefully vented it seems.
I ended up with the EverStart Maxx 24 too. 2012 model, wife's daily driver. It was starting to get the tell-tale signs of a weak battery - slow crank. I put my Noco battery load tester to use, and sure enough, applying load it was solidly in the yellow zone for a ~500CCA battery (490 rounded up). So 5 years and 38k miles on the stock battery. Not great, also not horrible.I decided to go with the Walmart Maxx 24 battery. It's slightly over an inch longer but the same width and height as the OEM. The tray is even longer than that, terminals are in the right place, the wires have plenty of extra play, etc. If you want to keep the cozy on your battery (and I'm really not sure what it's purpose really is....), just cut the end panel and duct tape it out the extra inch to accommodate the Group 24 battery.
Why did I choose the 24 over the 34? I was looking for overall improvement with a balance of attributes. For instance, going from 490 CCA to either 700 (Group 24) or 800 (Group 34) is a 45% or 60% improvement in short term output - either is a hefty gain, and more than ample for starting a 2.5l engine! There's also an argument that higher CCA is accomplished by packing in more plates tighter together, and that may be an issue for dendrite shorts.
To me, total energy storage (relatable to Reserve Capacity) was the deciding factor. A small battery like the OEM Group 25 is likely to be rated around 90 minutes (tested with a 25 amp draw). The 34 was rated at 110 minutes, while the 24 was rated 130 minutes. That's 22% vs a 44% improvement. Those are important numbers for when your kid leaves the dome light on, or the car sits for a few weeks at the airport, etc. A higher reserve capacity means you can discharge it longer before getting to that critical 50% discharge rate - the point where some batteries can be damaged and not recover their full capacity.
There's also a construction factor. To recap: Maxx 34N: 800 CCA, 110 min, 10.2 L x 6.8 W x 7.9 H versus the Maxx 24: 700 CCA, 130 min, 10.2 L x 6.8 W x 8.9 H. All things being equal, a battery that is taller may have more 'silt' room at the bottom, and may be less likely to lose a cell due to plate shorts from crud accumulation.
There's enough ventilation under the hood of the Subaru so no vent hose is needed. Guessing your old Audi had the battery hidden in the trunk where it needed the hose for ventilation--like my previous BMW.I'm guessing the answer here is no but figured it was worth a shot. I bought my 2011 2.5i premium to replace an 03' Audi A4 that died on me. I had just bought a new battery for the Audi about 3-4mos before it died and I'm wondering if it would work in the OB. It's a Napa Legend 7548 (other sizes are DIN H6, EN LN3, BCI 48) and while I know it's longer than the regular OB battery I think it would fit into the space. The thing I'm wondering is this battery has an exterior vent - on the Audi there was a little plastic vent hose that plugged into it which the OB doesn't have. Would I be creating a potentially unsafe environment if I put it in (assuming it fit) or is there enough ventilation under the OB hood to not worry about it? Otherwise will pop it up on CL to try and recoup some of the cost.
Ok, maybe I'll give it a shot then. Surprisingly it was under the hood in the Audi. I'm thinking it was another over-engineered part of the car (one of thousands I came across working on it )There's enough ventilation under the hood of the Subaru so no vent hose is needed. Guessing your old Audi had the battery hidden in the trunk where it needed the hose for ventilation--like my previous BMW.
I just picked up one of these to install in my 2012 2.5. Will update further once I have installed it.Did anyone try Costco Kirkland group 34 on Outback 2010+? Or any comments about this battery?
The previous discussion said that group 34 can fit in without the cozy sheeve, so, the size seems not a problem. The Reserve Capacity is 105 mins, and CCA is 795 according to Costco.
I'd like to hear the comments on this battery. It is time to have a new one now.
I really cannot see any downside to a higher capacity battery.I have been thinking about upgrading my battery soon. are there any ill effects upgrading to a larger battery?