Battery drain problem

Hello, so a parasitic draw on the battery can be diagnosed with a multi-meter if you have one. There is a maximum draw of .050 milliamps with the car off, to run the test you will put the multi-meter in series with the negative battery cable and you will see the draw, then start taking fuses out one at a time until the draw disappears. There is also another way to find a draw, with the meter set on 20 volt DC scale, with the car off go through and check every fuse, the fuse that has any type of reading (voltage drop) is the current draw.
https://www.2carpros.com/articles/car-battery-dead-overnight
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/symptoms-of-a-bad-car-battery

It's definitely not good if the battery froze over night, that can be dangerous. You don't want the battery to explode.