Alright so i picked up a bosch 750 cca battery and threw that in her on another -10 F day, cycled the glow plugs once and she fired up like it was a mid summer day. Hasnt given me any trouble since and its been nothing but cold here.
Owner reviews for battery
Purchased a Red Top 35 today and it fits! I did have to take the bottom bracket and flip it so that the side of the battery facing the headlight [+ -] stayed secure.
I'm using a Bosch Group 48 battery (it is 26 months old now) from Pep-boys. Their testing machine result says 'good battery' The guy at the store said, it was as good as a new one.
new bosch battery
Varta makes damn good batteries. One in my Rabbit lasted almost 5 years.
My GTI's original Varta battery lasted 7 yrs with normal driving/ number of starts.
I ended up buying a red top optima gel battery....expeeeensiiiive
So, I replaced it with a new optima battery anyways. Still have the issue.... Moved onto the car alternator. Tested it with my DVOM and it was giving out 13.7V at idle.
Optima batteries are not as good as they first were. Optima batteries have gone down in quality after being bought out, after Johnson Controls bought them and moved production to Mexico.
I had an Optima that behaved like this and took it back to AutoZone, they swapped it out without much hassle.
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