I kinda have two questions but they're both battery related so I just made one post.
1) Does it harm the battery if I cary my MacBook around with me and the weather is really cold? This has been a very harsh winter with temperatures going even below -15C. Sometimes when I take it out of my bag and then its pouch, it's so cold I can barely hold it in my hands.
I don't boot it up instantly when getting inside but it's usually sleeping nonetheless so technically turned on. I've read it's a bad idea to start using it since it could heat up too fast and condensate, but is it also harmful for the battery or for the laptop itself to expose it to low temperatures while in a bag? If so, what could be the damage and how can I avoid it?
2) I'm always trying not to use the MacBook while it's charging. Does this matter at all? Should I charge it only when it's sleeping or turned off? How about charging time? Should it be charged only until it gets 100% or I can leave it over night?
Model: 12″ Retina MacBook
Fabrication date: August 2015