When/how to charge battery of I pad

My i-pad power is down to 40%. Is there a preference as to when to charge battery? Also, should the power on the I pad be off or on when charging?

Hi and welcome .....
Fastest way to charge the iPad is to connect it to a wall outlet as USB takes a little longer. Doesn't matter whether or not the iPad is or not.
More about charging the iPad battery here.
http://support.apple.com/kb/HT4060
Carolyn
Message was edited by: Carolyn Samit

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