Use gravity transferring through portals so that you and your sphere perfectly fly though the hole.
Then climb the stairs with the sphere in hand to enter the room. Now that they are all raised portal on the first raised platform and jump along them and then jump to the left to enter a new room that wasn't accessible before. Climb onto the button and watch as the Pellet activates the other Pellet Catcher. Now place the other portal so that the Pellet passes under the pane of glass. 
Walk down the one that you already stole the Pellet from and put a portal where the other Pellet collides.
Once you have established you can open both doors with the sphere and Chell, turn out of the room and portal back up to the hallways of Pellets. Use the cameras as a stool to climb up on the other button. Then use portals to assess the strange secret room full of Doug Rattman's scribblings and steal two security cameras from it. Now put the sphere on one of the buttons in the room the behind the glass pane from earlier. This may take a few tries but you just need to get the right angle. Then crouch under the sphere to bounce the Pellet over the glass and into the Pellet catcher. Then turn left and walk into the room with the Pellet moving back and forth. To the left of the glass on the ceiling place the other portal so the the Pellet bounces off the slanted land and under the glass, into the Pellet Catcher. Then turn so you can see the two slanted land formations with glass in the centre. 
As you exit the hallways of pellets place a portal on the portal block that the last pellet is colliding with. Alternatively you can time it so that the pellet is heading towards you while facing forwards but the Pellet may get destroyed, with the new Pellet being released behind you (killing Chell). 
Repeat the last step here but walk backwards so that the pellet is moving the same direction as you but will still collide with your sphere. Keep walking until you reach the next high energy pellet release mechanism. Then as the high energy pellet is coming towards you walk towards it so that the cube blocks the pellet and bounces off. First to climb up to where the high energy pellets are, after collecting your sphere, use the sphere as a stool to jump up.
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