Why is the 7 cell battery cheaper than the 9 cell battery when configuring a T61?

Also, do you know if warranty is transferable (from one person/country to another person/country)? I'm asking this question because I think I'm getting a relative to buy me a T61 from U.S. and have my relative ship it to me (faster shipping...).
How are the USB ports for T61 compare with R61; do the ports allow wide USB keys?
And how long does the shipping take in US and how much is it usually?
MOD EDIT: As per forum rules a picture warning has been added.









