Capacitor connected to DC voltage - an Energy source

Capacitor connected to DC voltage - an Energy source
From the content:
0:00 Capacitor as energy source - Introduction
0:33 How to calculate the capacitance
2:03 Charge and Discharge Equations
2:34 What's the difference between a capacitor and a battery?
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Why can't we pump electrons into a plastic vacuume bottle? Like just fill it up?