Originally Posted by donbryce

Crappy Tire.

I swear by these, got mine from the manufacturer, about $100.00CDN if I recall. My streetrod sits idle for weeks at a time and was always draining the battery (I think it's a bad alternator diode).
You might want to do a test and pin-point the source of the drain, which it sounds like you have, because cold or not, something is killing that battery and the new one will get the same treatment.