I think I'm having a problem with my doorbell when it's bitter cold. 

 It went to zero during first 0⁰ temps. 

Three days of a cold snap and it only went to 3% during charging. Temp went up to 40's and 100% charge. Now that it's bitter cold it's started all over again. 

 Also, it seems to go offline when it's very cold. Like right now, it's 14 and been offline all afternoon. Was on earlier. 

 Am I just imagining this? Would these batteries and Wi-Fi have issues with subzero temps? 

 For reference, the doorbell is under a  porch, not out on the open.