What will I miss out on with X220 versus X230?

[rsutoratosu]

I guess that means anyone who wants a good deal on an X220 battery should watch for my upcoming "almost used once" sale on the marketplace forum

Too bad I found this out late... I have a x220 with 9cell, so I figure ill save some money and use the existing battery in the x230. I only ordered the 4 cell with the x230. bios boot up says nooooooooo...

oh well, i guess i gotta shell out for a x230 battery