Only for the AAO/110 and the phased out AAO/115 models. The new model AAO/103 (10" LCD, 160gig HDD) has it's six cell battery flush to the chassis/casing.
BTW, it's not only Acer that have their six cell battery extending out from it's chassis/case. Even Asus EEE, Lenovo S10, Red Fox, etc have their netbooks' six cell battery extending out since they were initially intended to have only three cell battery to lower the retail price of the units.
But having the battery case extended out of the chassis is a minor consequence to having twice more battery life without having to plug-in. It's almost possible to use such netbooks for the whole day on battery power alone if you economize power usage (low screen brightness, etc).





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