How to conserve energy?

[amateur]

Hello scientists,

I have a question that's crucial to a project I'm working on:

 

When I produce electricity with a magnet and a copper wire, I would like to conserve the energy I have produced instead of wasting in it on a lamp.

Is there any way I can keep the energy I have produced into Batteries or something so I can use it later, if it's possible is there any way I can tell that the battery has been fully charged? like an LED lamp that changes colors.

 

Thanks for reading this and I hope you will provide me some positive feedback.

See you guys later.

Edited September 9, 2012 by amateur