1. Turn your Toshiba L635-S3100RD laptop over.
2. Find the laptop battery release button lock for your Toshiba L635-S3100RD laptop.
3. Now that your Toshiba L635-S3100RD 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 L635-S3100RD battery is removed, grab your replacement Toshiba L635-S3100RD battery for installation.
6. Insert the battery into the slot. Push the Toshiba L635-S3100RD battery towards the laptop and secure it in place.