Bit of an odd one this, in that I've been getting "this accessory may not be compatible" messages on screen when charging. Phone still seems to charge though. The odd part is that it's the Apple cable that's giving this message! I've tried three of them (2 already in use, 1 unwrapped from iPhone box) and have been able to repeat the issue a few times. Have given the charge connector a really good clean, as well as the cables themselves - just in case - but it's still happening. iPad mini with same cables doesn't exhibit the same behaviour. Not had time to drop back to 6 or do clean install of 7 b2 yet, so will try again with that tonight. .... bug report submitted via dev portal.