[Ronbo]

I thought of one thing to add concerning batteries and their ratings.

Anymore you typically see car batteries rated in CCAs yet most starters never even approch this value. Starters on V8s run around 200 ~ 300 amps of current. So it really doesn't matter if the battery can deliver 900 CCAs. Granted there is a higher in-rush current for a few milliseconds but the extra couple milliseconds to get the motor up to speed is not an issue.

What does matter is A/hr (Amp hours) this is the capacity of the battery:

100 Ahr = 100 Amps for 1 hour or 1 Amp for 100 hours.

100 Ahr = 300 Amp starter run for 20 mins. or 200 Amp starter for 30 mins.

So in reality a 900 CCA battery with 100 Ahr is really a worse choice than a 600 CCA battery with 120 Ahr capacity.

Freezing temps rapidly drop these values by 30% or more which is why your battery conks out on the first cold day in the winter. If it went completely dead then a plate or connecting strap likely fractured.