Sorry - this is my second post after getting my 42mm AW Sport yesterday. Really quick one: In all the years I've been using an iPhone, I've always had bluetooth turned off. But Apple Watch requires me to have it on for full functionality. Have you guys noticed a hit on battery life after doing this? Or (since it uses bluetooth low energy) is it negligible? I guess I'll find out over the next few days! Loving the Watch BTW Fella.