Originally Posted by
Tourist in MSN
You should not charge Li Ion batteries below freezing temperature. But I suspect your light warmed up pretty fast when you got it inside, so it was probably warm enough to charge once you started charging it.
I have integrated dynamo, lights, and lithium batteries integrated systems that run year-round, one of them a decade presumably now. They do fine, and that decade-old powers a horn that draws far more current than lights.