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 X220 Review - Notebook Reviews by MobileTechReview
Extended Life LiIon Slice Akku für Lenovo ThinkPad X220 X230 Serie Typ 19+ | LapStore.de
ThinkPad slice battery for X220 / X230 - YouTube
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