I replaced weak cells of hybrid battery and rearrange them but when I start the car I hear a clicking sound of hybrid relay and then car goes to ready mode. When I shutdown the car it also clicks relay. I checked every thing is ok. But why clicking sound of hybrid system is coming. I never heard it again.
If you haven't reinstalled all the rear trim panels, then yes, the relay clicking is really pronounced. The panels are really effective in deadening the sound down in the back but the car has clicked those relays on startup and shutdown for all the time you've owned the car.