If Windows is unable to recognize your second battery pack after installation, follow these steps:

1. Ensure Proper Installation: Make sure the second battery is correctly inserted into your device.

2. Restart Your device: Sometimes, a simple system restart can resolve recognition issues.

3. Charge the Battery: If the second battery is completely depleted, plug it in and allow it to charge for some time.

4. Check Battery Status: Click on the battery icon in the bottom right corner of your screen to check if the battery status is too low. If so, Windows may not recognize it until it reaches a minimum charge level.