Car batteries in Korea

Random question I'm sure, but are the car batteries in Korea just not made for the cold? We have a brand new car and already twice the battery has died if we don't drive for more than a few days. Most recently it wouldn't even unlock the doors. Several colleagues have had similar issues. It stays parked in garages.

Is there something we are doing incorrectly? I unplug the camera any time it's parked. We only drive to daycare and back ~20 minutes each way so maybe that's why? The alternator doesn't have time to fully charge it? Just trying to come up with reasons. We did a long-term lease through Lotte. Debating it worth having them check it out.