Could I use 9V 250mAh battery as Panda II power source?
Sure, if it is regulated, meaning use the barrel jack. It won’t last very long, though.
Yup, from the Panda II product page
[quote]Active power consumption 103 mA.
Idle power consumption 65 mA.
Hibernate power consumption 3.75mA[/quote].
So you might get around 2.5 hours of actual run time… if you’re hibernating and waking on interrupts I suppose you could go much longer though.
And you have nothing else connected to the board