Verified answer

Telecom signals range in strength over a wide range, but 2 volts peak to peak is sometimes available, so it can charge one nicd cell to about 1.2 volts with the help of a voltage doubler circuit.

If you remove half the power stored in the nicad, it may take days to fully recharge, depending on the signal. The power removed will likely increase the noise on that telecom channel. You will need to use shotkey diodes in the doubler circuit otherwise you need a minimum of 2.5 volts peak to peak which is likely very rare. Neil

Just from your wording, you have no idea what this is about, and there is no way I can instruct you in all of the basics of electricity and electronics in a few paragraphs.

Cumulating microelectronic energy by laser is already a common experience.

Enjoy something that is already existent.