I got my new series 2 Watch and all is well. MY original watch I had to send in for repairs and just got it back today. Put it on the charger and it won't charge. Messed with it to no avail. Put it on my wife's original charger and it seems to charge. Put it back on my series 2 charger and it won't charge. I dug out my old charger and it again seems to be charging. Is there a difference being there is a bigger battery in series 2? I also get this message on series 2 charger ( To use this accessory, upgrade watchOS via the Apple Watch app on your IPhone.) DISMISS One thing I have noticed is the series 2 cable is a lot shorter if that means anything. --- Post Merged, Sep 27, 2016 --- on old charger I went from 9% charge to 46% charge so decided maybe its was so low that was the problem. Just switched it to new charger and cable and the same message popped back up so hit dismiss and it went back to not charging. Put back on old charger and it charges fine without the message. Once I get it fully charged I will update to OS3 and try again to see if it will work on new charger.