You're nothing thinking this through. It could trickle charge a capacitor or supercapacitor that has a very low self-discharge rate. There's a circuit called a

You're nothing thinking this through. It could trickle charge a capacitor or supercapacitor that has a very low self-discharge rate. There's a circuit called a Joule Thief that can extract usable power from very low voltage sources. There are other tricks to do voltage multiplication like using diodes and capacitors, but there are also micropower switching boost converters too.