Shake it & Charge it..

Shake To Charge Battery

Shake your phone and charge your battery.
Use your motion power (kinetic energy) to charge your battery and never need a battery saver. Check the battery indicator (battery monitor) and see that when you shake the phone (or you move) your battery is being charged slowly.
No need for a battery widget anymore to check your battery.

Unlike solar charger or eco charger, it doesn't damage your phone and battery. You can even uninstall juice defender.