Comment by malfist

Ha! That's a right of passage, lithium ion batteries state of charge drops to almost 0 when it's below freezing. If you left your phone out with your laptop it'd have the same problem. There's actually special phones you can get that are meant to keep functioning below freezing, usually by means of a battery heater.

I too have done the same thing you experienced.

Now I run everything off of a minipc with a lead acid UPS.

This is also why most of your power packs to run astronomy gear are still lead acid and not lithium. Celestron's not just trying to sell you last generation equipment at a steep mark up, there's a reason for it