If you are tired with heavy laptop, and only 4 hour battery life and still don’t want to compromise on performance, then I think Lenovo ThinkPad X200 is the right choice for you!
With 9-cell battery it’s 3.58 lbs
More than 9 Hours
Intel Core2 Duo processor P8400 (2.26GHz, 3MB L2, 1066MHz FSB)
Intel Graphics Media Accelerator 4500MHD
2 GB PC3-8500 DDR3 SDRAM 1067MHz SODIMM Memory (2 DIMM)
12.1 WXGA (1280×800), 2×2 UltraConnect II antenna , WWAN, Camera
If you think it’s not compact, why don’t you measure the length of your own laptop to compare!
If you are a mobility geek then this is a better choice for you as it’s available at a very affordable price, around 1000$. However you may want to research more about it before you buy at Lenovo.