Specific Gravity varied widely after topping up.

I am in Coastal San Diego. Rarely drops below 40f.

Cold temperatures thickening oil are not a factor in my engine starting, and even with weak batteries the engine has no issues cranking in the morning. I usually just use only the 7.5 year old wally world 27 to start it, and after 20 seconds or so, bring in the depleted Crowns to the alternator circuit. My Ammeter goes from ~7.5 amps, to ~58 when I turn my battery switch to both in the morning and more rpms will send the amps up into the 90's