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What kind of car is it?
How old is the battery?
I see, thanks. It sounds like the battery is just not holding a charge anymore. If it were with the charging system or alternator it would have drained down each time it ran.
The cold weather will always lower the CCA, (cold cranking amps) of a battery and even the best batteries only last 5 years or so.
The good thing is, most of the major parts stores will do a load test on the battery and check the output of the alternator, free of charge and even install a new battery, if that one does show to be bad.
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A good battery should stay charged for hours with the "accessories on" and after driving it seems that you had stated, "it barely started back up".
If it starts good every time now however there may not be a problem at all.