99 Protege Electrical Problem

I have a '99 Protege with AT. About a year ago I replaced the battery and alternator after it died driving home one night. Last night the battery light came on when I was at a friends house. I drove it home without any issue. Today while driving the dash lights began to flash and the radio shut off, then the car died. I haven't had a chance to check the alternator yet since the car is stuck on the road but it seems odd that a near new alternator or battery would go dead so quick. Any thoughts on what else I should look for?

Ps. It has been around 25-30° at night here, I know batteries don't like the cold but this seems like something different.