Apple claimed to address the latter, and I was willing to try them out on the former.
Unfortunately the first two batteries we charged were defective:
The first two batteries I charged generated a blinking yellow signal. Either the batteries or the charger are defective; I suspect it's the batteries.I'd hold off on this device for a while. Wait until there are at least forty Amazon reviews so we find out how common this problem is.
It could be just bad luck, but I suggest waiting a while before ordering a charger.