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UP2 use dc drive by battery?

Hi sir,

I want to intput DC power to drive UP2 by battery.

and try some method below ,but UP2 still can't work.

AC/DC adaptor (12V/29A) >> DC/DC module (5V/4A) >> UP2 = failed

DC power supply (5V/4A) >> UP2 = failed

Battery (12V/3cell) >> DC/DC(5V/4A) module >> UP2 = failed

UP2 has output opening signal on monitor, then it doesn't work at few second .

could anyone help me ?

thank so much.