1. Turn your Sony VGN-C210EH laptop over.
2. Find the laptop battery release button lock for your Sony VGN-C210EH laptop.
3. Now that your Sony VGN-C210EH 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-C210EH battery is removed, grab your replacement Sony VGN-C210EH battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-C210EH battery towards the laptop and secure it in place.