lithium batteries are lighter weight so that's 1factor. and even at the nimh being 800 mah per cell, they are wired in series, 4s. lithium are 2s, 2 in series. you can run 4 in a 2s2p setup. 2 series 2 parallel. when batteries are all in series they maintain a single mah rating. 4 800 mah ran in series is still 800 mah. you can run 4 liths 2s2p and since you have a set in parallel you double the mah rating. 4 liths 2s2p at 750mah a cell = 1500 mah.
and since you have more volts you won't have to be as high of throttle to get the same performance, therefore causing less draw from the battery.
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