facelessloser on Twitter: "Not surprising but adding a 9 cell battery to my thinkpad x220 made it quite a bit heavier. Hope its better battery life then my old aging battery #ThinkPadX220 #
29++ 9 Cell Battery for Lenovo ThinkPad X220 X220i
9 Cell 29++ Battery for Lenovo ThinkPad X220 X220i
Lenovo ThinkPad X220 Hands On, Details, Specs And Video