According to wikipedia and other sources LiIon batteries can be permenatly damaged by charging below freezing. Ring’s own FAQ states that their Battery powered doorbells and Camera’s operate between -20 and +50 C, we’ve been around -10 to +10 C here the last week or so and I’m not seeing any charging or not enough to notice.
If I had to hazard a guess I would suggest that Ring adjusted the latest firmware to stop the batteries from charging below freezing in order to avoid damage. I know for a fact that this was not always the case as I have not had this issue in previous winters however it does make sense.
That said it would be nice if Ring gave people a heads up on this and/or made mention of it in their FAQ (assuming this is the cause). Most companies put out release notes when they update their firmware so that customers can see what was changed and know what to expect, where are Ring’s release notes for their firmware? I’ve looked and have not been able to find them. And if this is the case then why isn’t Ring support explaining this to people instead of just saying it’s too cold.
Of course the problem here is that if they admit that their products have reduced functionality anytime the weather drops below freezing (i.e. batteries won’t charge) they have basically eliminated themselves from the 50% of the U.S. and 100% of Canada which can see below freezing temps.
To be honest I have generally been happy with the Ring products, when they work they seem to be really good. However between this support (or lack thereof) and all the security issues in the past little bit I am advising people to reconsider and look at other options.