1. Turn your Sony VGNCR320ET laptop over.
2. Find the laptop battery release button lock for your Sony VGNCR320ET laptop.
3. Now that your Sony VGNCR320ET laptop battery is unlocked, find the battery release button down.
4. Holding the laptop battery release button, gently pull your battery away from the laptop.
5. Now that your Sony VGNCR320ET battery is removed, grab your replacement Sony VGNCR320ET battery for installation.
6. Insert the battery into the slot. Push the Sony VGNCR320ET battery towards the laptop and secure it in place.