1. Turn your Compaq V4203EA laptop over.
2. Find the laptop battery release button lock for your Compaq V4203EA laptop.
3. Now that your Compaq V4203EA 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 V4203EA battery is removed, grab your replacement Compaq V4203EA battery for installation.
6. Insert the battery into the slot. Push the Compaq V4203EA battery towards the laptop and secure it in place.