I agree.  A quick Google search suggests that the human body requires about 100 Watts[1] of power.  On the other hand, a small 12 volt car battery is able to provide 45 Amps over an hour, which implies that it can support a power draw of 540 watts for an hour.  Even if human activity required 200 Watts, an android with human level power efficiency should be able to operate for over 2 hours with the technology of today&#x27;s small car batteries.  Of course, my math could be wrong :-)<p>[EDIT] -
My point here is that even if improvements to battery technology remain slow or constant, with sufficient innovation in energy efficiency and algorithms, we could still have robots with usable to good running times.  Just figuring out a reliable walking gait and building materials for passive dynamic walking can significantly reduce the power requirements.[3]<p>[1] - <a href="http:&#x2F;&#x2F;hypertextbook.com&#x2F;facts&#x2F;2001&#x2F;JacquelineLing.shtml" rel="nofollow">http:&#x2F;&#x2F;hypertextbook.com&#x2F;facts&#x2F;2001&#x2F;JacquelineLing.shtml</a>
[2] - <a href="http:&#x2F;&#x2F;www.chem.hawaii.edu&#x2F;uham&#x2F;bat.html" rel="nofollow">http:&#x2F;&#x2F;www.chem.hawaii.edu&#x2F;uham&#x2F;bat.html</a>
[3] - <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Passive_dynamics" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Passive_dynamics</a>