I have now been using AGM batteries in my 2001 FOZ for the 8 years. The last AGM battery lasted 5.5 years, and the current one is 2 years old. Prior to using AGM batteries, I was using the stand FLA(Flood Lead Acid) batteries and none of them lasted more than 3 years!!! This is due to the heat(40C) here in Texas, which always kills FLA all the time. Very rare to see cars with dead batteries in the in winter, usually see dead batteries during the summer!!!! Heat kills FLA.I guess it's saying that AGM is best used as auxiliary batteries; I have AGM's as aux batteries in both my cars but I won't use them under the hood. The Foz aux battery sits in the rear passenger foot well and and I have 2 mounted in the tub of my Triton ute.
I use a 50L ARB fridge for adventure camping. I put a 27F Diehard Platinum in my FJ Cruiser back in 2012. Five years later, it will still run the fridge for almost 4 days without starting the truck. I just purchased an X2 AGM 27F and shoehorned it into my 2018 Forester. It's quite a bit longer than the Group 35, but seems to match in height and width. There is about 1.5-2 inches of clearance between the motor and the battery, so as long as I don't break a motor mount or a battery tie-down, I think I'll be okay. If I run into any issues, I'll be sure to post my findings in this forum.Ive used batteries plus X2 agm batteries in several cars and trucks with no problems. The group 35 is 740 CCA. I’ll put one in the forester when I need one. They appear in pictures to be identical to North Star batteries which get very good reviews. I don’t see anything on operating temperature range but they have a 60 month full replacement warranty, not prorated but full replacement for 5 years so I’ll take my chances for the extra power agm batteries provide. One other advantage is they are sealed so no more battery post corrosion to clean up.
Any issues so far with the battery in the engine bay with all that heat? Supposedly AGM batteries don't like heat?After 3 years with the OEM battery I installed an Exide FP-AGM35 Automotive AGM Battery in my 2014 Forester. Now she turns over like she should on the sub zero mornings that are all too common in Michigan's Upper Peninsula.
Well, for the Odyssey model 35-PC1400 recommended for the Forester, the operating temperature is -40F to 176F, so heat is actually not a problem for these AGM batteries.Well since this was resurrected
ODYSSEY battery - Design Advantages
xtreme temperature tolerant
Operating temperatures from -40°C (-40°F) to 45°C (113ºF), for models without a metal jacket, and from -40ºC (-40ºF) to 80ºC (176ºF) for models with a metal jacket.
and odyssey batteries are 20% off right now. Code SEMA2017
Props to this guy on bitog for posting it
Sale through 11-14-17