HT1430 What is the output power,      when using a portable batteries that the iPad need to charge up??

What is the output power needed to charge a iPad,  when using a portable battery?
Will 2.1A output work?
Thanks

The wall charger which comes with the ipad is a 10 watt charger, it's current is 2A, voltage is 5v. 2x5=10 w.
2.1Ax5v = 10.5w.

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