NiMH is probably more reasonable? But still, about half the energy density compared to Li-ion. http://www.epectec.com/images/battery-comparison-energy-density.

NiMH is probably more reasonable? But still, about half the energy density compared to Li-ion. http://www.epectec.com/images/battery-comparison-energy-density.jpg http://www.epectec.com/images/battery-comparison-energy-dens...