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
X230 6-cell battery re-celling considerations, 30+ and 44+ battery info [includes pictures] - Thinkpads Forum
Lenovo ThinkPad X220 Hands On and Mini Review
I put the Lenovo ThinkPad X220's 24-hour battery claim to the test | Windows Experience Blog
Lenovo ThinkPad X220 Review - Notebook Reviews by MobileTechReview
PC | Internet Zone: Lenovo X220 Slice Battery 19+
Lenovo ThinkPad X220 Hands On, Details, Specs And Video