If your FZ152 doesn't power on it could be because your rechargeable li-ion battery has not been fully charged or may be depleted of adequate charge.
This could also be because the li-ion battery has not been inserted into the FZ152 camera properly.
Be sure to fully charge your FZ152 using the supplied USB cable and AC adapter before trying to use.
Be sure that the li-ion battery metal charging points are properly aligned with the metal charging points inside the FZ152 li-ion battery compartment.