Having a backup charger is very convenient if you use the laptop at two places regularly, e.g., at home and in the office, as you can put a charger at each place and will not need to carry the charger everyday.

Due to moving I am selling an original 20V 65W Lenovo Power Slim AC Charger/Adapter with Power Cord for $15. Clean and excellent condition. Never had an issue. Not an OEM or refurbished product. Fits almost all the Lenovo laptops only except those that need 95W adapters. On campus.