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A week is not a very long time to leave a car alone, and 3 batteries in 5 years is a lot.
Did you have the batteries tested, or did you just replace them when they stopped being able to start the car? Could it be a problem with the alternator?
When the battery gets fully discharged it degrades much faster.
I'd be searching for what's draining the battery and in the meantime I'd add a battery disconnect switch for these periods.
Yeah, I had a lot of the stuff tested about 3 years ago. They seemed to think there was nothing wrong other than me abusing the battery by not driving or charging it enough. I will say it takes a LOT of juice for me to start my car, I probably cheaped out in the past and didn't get enough CA.
Do you drive mostly short trips? In cold weather it might take 20 minutes of driving before a battery even starts accepting charge (a cold battery charges slower).
Usually 40 mins each way once or twice a week, then maybe 20 mins one day. Then it might not get driven at all for 5-10 days.
I am guessing it discharged too much and then froze, killing it off, since it's been really cold.