no sir the cell chemistry in Lithium Ion (Li-Ion) only has so much energy density per kg.
the marketplace wants things smaller, faster, better while also increasing battery run times. unfortunately, compromises in battery design have to be made. Li-Ion is also extremely unstable so there has to be electronics in place to monitor the cell chemistry, discharge/recharge rate, etc etc.. however as a result of this, you can only pack so much into a small space. so as things get bigger (screens, CPUs, full HD recording/streaming larger RAM--which requires power) the battery packs get smaller to make room for the other electronics, which leads to marginal or lesser battery life than a comparable product (ipad vs. Xoom--Xoom has newer tech, faster processor, etc so battery life wont be the same as the ipad)
there are newer technologies that are on the horizon.. the trick now is to shrink those new cell structures down to a mass-produced size.
pound (or kg!) per pound, Li-Ion has the most energy density per cell of the other commercially available chemistries (nickel metal hydride, and nickel cadmium)...