We can already store electrons in a container, we call that a capacitor. You separate 2 conductive plates with a dielectric and then connect the plates to a voltage source to deposit electrons on one side and remove electrons from the other (creating a difference in electric potential). You can then disconnect the voltage source and you will have electrons in a bottle. When you connect those plates to another circuit, they will discharge. The more surface area you have, the more electrons you can store. Electrolytic capacitors tightly roll the conductors into a spiral for space efficiency.
This cannot be used to gain any more energy than you used to put them all in there.
Same for me, local and the other tabs work but the main timeline is failing.