1. Turn your Sony VGNCR490 laptop over.
2. Find the laptop battery release button lock for your Sony VGNCR490 laptop.
3. Now that your Sony VGNCR490 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 VGNCR490 battery is removed, grab your replacement Sony VGNCR490 battery for installation.
6. Insert the battery into the slot. Push the Sony VGNCR490 battery towards the laptop and secure it in place.