1. Turn your Compaq 2161AE laptop over.
2. Find the laptop battery release button lock for your Compaq 2161AE laptop.
3. Now that your Compaq 2161AE 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 2161AE battery is removed, grab your replacement Compaq 2161AE battery for installation.
6. Insert the battery into the slot. Push the Compaq 2161AE battery towards the laptop and secure it in place.