I don’t think I get the 24 hour battery life that is touted for the Fuse. I use a combination of Sennheiser Px100 and Sennheiser Mx500 earbuds and so far it seems like I get about 15 hours. I do listen to videos about 10% of the time, FM radio about 30%, and mp3s and Audible audiobooks the rest of the time. My mp3s are encoded at various kbps from 192 to 320. I was hoping I should get over 20 hours, but that isn’t the case. When I listen to audiobooks, I notice that the battery life decreases about 10% every half hour. I have upgraded to the latest firmware V01.01.22A. Also my brightness is set at the second lowest level.
I’ll track my battery life more accurately from now on to be sure, but it seems to be disappointingly low. On a side note, the recharging time by USB is surprisingly quick. I think I get full charge in just one and a half hour.