Note. this will in fact work as you can see. but when you think emergency think REALLY REALLY SHORT emergency. maybe as little as a few minutes of charge.
a typical alkaline 9v battery is around 500mah (optimistically as low as 400mah)
your typical cell phone battery is 1200 to 2000 mah
and then you have the losses in the 9v battery and the losses in the 12v adapter and then the losses in the phones internal converter so you would be lucky if half the capacity of that 9v battery made it into your phone so optimistically 250 to 300mah
or around a 10 to 15% charge. tops. for a smaller phone (1200mah or less) you could get a 30% charge.
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