The easiest way to put videos on the Sansa Fuze is to go on Youtube. Once your on Youtube, search the video you want. Add 'pwn' in front of the web address and click "Download MP4 Version" Once you...
You will see a lightning bolt in the bottom right corner next to the batttery bar. The Fuze will say connected and the blue light will be revolving in a circle..
it depends on how frequintly you use it. for me, i use it on the 4 minute drive to school, and the 10 minute drive home, (i take the bus) and at night for 20-30 minutes, and it lasts about a week....