Sure, if we pretend a Nintendo DS with a +8 hours of Battery life never existed.
don't get me wrong, this news that battery life is over 4 hours is great but it's not optimal.
You can't compare the two, the DS is nowhere near the power or complexity of the Vita and the one section of mobile tech that is not advancing very fast is battery technology.
The DS and its battery life means nothing to the Vita, in fact the Vita being vastly more powerful and complex and still managing that amount of battery life is extremely impressive.