1. Turn your Sony VGN-NR285ES laptop over.
2. Find the laptop battery release button lock for your Sony VGN-NR285ES laptop.
3. Now that your Sony VGN-NR285ES 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 VGN-NR285ES battery is removed, grab your replacement Sony VGN-NR285ES battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-NR285ES battery towards the laptop and secure it in place.