Question about Lenovo USB-C Wall Charger (EU)

Yes, you can use this charger to charge a smaller rated laptop (input 19.5V 2.31A 45W). The charger supports Power Delivery (PD) technology, which allows it to adjust the power output to match the device's requirements, ensuring safe and efficient charging. This means it can supply up to 68W, but it will only provide the power needed by your laptop, which is 45W in this case.