"Seems" is the keyword here.

http://en.wikipedia.org/wiki/ASUS_Eee_PC

"The 901 features an Intel Atom Diamondville CPU clocked at 1.6GHz, an "expanded" battery (listed as 6-cell), and "Super Hybrid Engine" software for power management which will provide a battery life of 4.2 to 7.8 hours."

"The Eee PC 900A features almost the same specs as the Eee PC 901 (except the primary SSD, Bluetooth, 1.3M pixel webcam and the 6-cell battery, that has been replaced by a 4-cell battery) but in a case nearly the same as used at the Eee PC 900 model."

Official ASUS product web page