My OnePlus One (old, I know) worked just fine this winter. I was able to read on my phone the entire 20 minute walk to the store and back. It's when I got home

My OnePlus One (old, I know) worked just fine this winter. I was able to read on my phone the entire 20 minute walk to the store and back. It's when I got home into the warmth that it would end up rebooting/saying the battery was empty. It's possible that the phone generated enough heat to stay warmer though. The main problem with operating it was actually how cold my hand that's holding the phone gets since it doesn't move like the other hand does. I had to wear double gloves.