Yes you can. You can do it by USB or plug.
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.