Laptop AC Adapter 20V 8.5A 170W Square tip ADP-170CB B SA10J20113 54Y8975 Power Charger Compatible with THINKPAD W541 THINKPAD T440P THINKPAD W540 Notebook Power Supply - Newegg.com
AC Adapter Charger For Lenovo ThinkPad W540 W541 135W Power Supply ADL135NLC2A 707943738556 | eBay