10400mAh Replacement Lithium Battery Pack for Asus Eee 7/8/9-Series Laptops (A22-P701H Compatible)
Also in white: http://www.dealextreme.com/details.dx/sku.17083
Bought one of these a few weeks ago, and after using it can declare it the Bees Knees.
It is fitted to my eee701 and offers about twice the capacity. When fitted, it raises the back of the computer by just over an inch and a half. This gives the bonus of an angled keyboard that makes for more comfortable use.