Why does battery die quick when watching a movie?

[lkillen]

I watch a lot of movies on my phone. I also have the extended Sedio battery. One of the bigger pleassures my wife and I have is camping and watching a couple of movies. We ride the Harley through the mountains and camp for a week at a time. Sometimes I string the cable from the Harley into the tent but lately I don't. When I am done, I just plug the phone in and let it charge eth remainder of the night in the saddle bag. Having said that, I think I can get through a full length ~700mb movie with external stereo speakers and better than 80%. I have no complaints.