Not like I am having a real problem, but it is making me curious. 2 of my 6 'Intelligent Flight Batteries" operate and charge normally, however, once the charge cycle completes, all four lights on the button blink rapidly, at the same time, until disconnected from the charger. Has anyone seen this? There is no reference I have seen to this and I do not know if it is indicative of trouble on the way or if it is just one of those "Hmmmmmm" things. Thoughts appreciated from our more experienced Air 2 pilots.