Since getting my 6S+, I've noticed it's very slow to charge when hooked up to the charging cable via my work PC's USB port. With the phone screen off, in 30 minutes it only charged 7%. By comparison, when plugged into a wall outlet at home or into my car charger, it will charge at least triple that amount in the same time. In fact, even though it's plugged into my computer right now, the battery percentage is slowly dropping during use, even though it's plugged in! This never happened with my 5S which is why I'm curious. Does the 6S+ use that much more power? Or is my cord? Or is it my piece of crap work PC? At home I use the OEM Apple cord, in my car is a Radio Shack cord & at work it's an Anker cord (both the Radio Shack & Anker cords are Apple certified). I plan to bring in a power brick from home tomorrow to see if it'll charge faster, I'm just curious as to why it's SO much slower now.