1. Turn your Sony VGNCR320EP laptop over.
2. Find the laptop battery release button lock for your Sony VGNCR320EP laptop.
3. Now that your Sony VGNCR320EP 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 VGNCR320EP battery is removed, grab your replacement Sony VGNCR320EP battery for installation.
6. Insert the battery into the slot. Push the Sony VGNCR320EP battery towards the laptop and secure it in place.