Amazon.com: Compatible for Lenovo ThinkPad Slice Battery Compatible with ThinkPad X220 X220s X220i Tablet 65Wh 42T4967 : Electronics
Just bought a quirky x220 slice battery. Looks exactly like a 19+, but says 20+. Works completely fine with 1% wear. Does anyone know what it might be? : r/thinkpad
Lenovo ThinkPad X230 review - The Verge
Lenovo ThinkPad X220 Series Slice Battery 42T4967 42t4904 for sale online | eBay
Lenovo 6-Cell Battery Slice for ThinkPad 0A36280 B&H Photo Video