It works fine, but is missing some circuitry to satisfy the laptop charging system, Genuine 170W Lenovo ThinkPad W520 4276-3KU AC Adapter Charger Power Cord, Salt lake Utah, 84107
Genuine 170W Lenovo ThinkPad W520 4276-3KU AC Adapter Charger Power Cord
45W USB-C Lenovo ADLX45ULCA2A AC Adapter Charger
The charger works just fine, but the charging system complains when you plug it in. In fact the charging system says it will charge he laptop, but it lacks some management circuitry. A small annoyance.