I don't believe it sucks so much more battery ... didn't tested it yet but maybe you shouldn't fear so much about it.

For High motion scenes, you have 2 options :

1/ Two passes encoding will use higher bitrate for high motion scenes, giving less or no "Mosaïc" artefacts BUT then the bitrate will be too high for the tablet and the playback jerky on these scenes.

2/ One pass encoding (650 Kbps) will use a constant bitrate, High motion scenes will show some "mosaïc" effect but will play smoothly. The good thing is that scenes with average motion will be very detailed and beautifull on the NIT !

So maybe you should choose your encoding parameters depending on your movie ... if it's pure action style, with lots of exploding things, cars races ... Lower resolution maybe better.

I tested "my" settings on the Ice Age 3 trailer and the result was very good.