Operation under emergency conditions

Dr. Pedro E. Colla (LU7DID)

In a bare bones emergency situation to which extend the D4D works with a high capacity 5V pack as it's sole power supply? (assume connectors worked out properly).
¿Does the D4D work with less performance/power? ¿Works very degraded? ¿Doesn't work at all?
Thanks for your answer. 
73 de Pedro, LU7DID

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