Quick look at the Lenovo ThinkPad X230 (hands-on) | ZDNET
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
Just Got slim battery for my x230 : r/thinkpad
X230 (X330) – XY Tech
Lenovo ThinkPad X220 Hands On, Details, Specs And Video