I had the same problem. It might be because you have an older iPod that is not compatible with the newer dock or you might have an older dock not compatible with the newer ipod.
no
yes
i am pretty sure it can sinse my ipod nano 5g can charge on my dads 3g dock
no, but you can charge it on there.
yes
computer or ipod dock
get a new ipod nano
The operating system has absolutely nothing to do with the charge time. The iPod nano should take about 3 hours to charge completely.
About an hour or less
iPod Nano 3rd gen takes around half an hour to charge fully.
Yes.
When the battery runs low.