1. Turn your Compaq A935EM laptop over.
2. Find the laptop battery release button lock for your Compaq A935EM laptop.
3. Now that your Compaq A935EM 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 Compaq A935EM battery is removed, grab your replacement Compaq A935EM battery for installation.
6. Insert the battery into the slot. Push the Compaq A935EM battery towards the laptop and secure it in place.