1. Turn your Toshiba L550-13C laptop over.
2. Find the laptop battery release button lock for your Toshiba L550-13C laptop.
3. Now that your Toshiba L550-13C 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 Toshiba L550-13C battery is removed, grab your replacement Toshiba L550-13C battery for installation.
6. Insert the battery into the slot. Push the Toshiba L550-13C battery towards the laptop and secure it in place.