Here are the specifications for the Lenovo laptop adapter you described:
- **Brand:** Lenovo
- **Power Output:** 90 watts (20V * 4.5A)
- **Voltage:** 20 volts (20V)
- **Current:** 4.5 amps (4.5A)
- **Connector Size:** 5.5mm x 2.5mm
This adapter is designed to provide power to Lenovo laptops that require a 20V power supply with a current rating of 4.5A and use a connector with dimensions of 5.5mm x 2.5mm. It's crucial to verify compatibility with your specific Lenovo laptop model before purchasing to ensure it will work correctly.
You can typically find this information in your laptop's user manual or by checking the label on your current adapter. When purchasing a replacement adapter, ensure it meets safety standards and is compatible with your laptop model.