Locate the battery compartment on the bottom of the camera directly below the mode dial.
Find the marked arrow on the battery compartment door and firmly push following the arrow's direction to release the latch.
I don't think its wise to install a battery when your going to be removing the control board as this could cause a short circuit and the board and or the battery could burn up, you should remove the battery prior to working on the internal parts of the camra
I quite agree, I once had the misfortune to get a severe electric shock from the gubbins of a digital camera.
It is best too remove battery and wait for capacitors to discharge.
It would be advisable for this guide to be redone
Release the latch and allow it to completely open.
Insert the battery by following the diagram on the inside of the compartment door.
Close the compartment door and firmly press on the latch until you hear a clicking sound.