since FW 2.80 my battery drain goes up to 50% more as before, haven't changed anything on my setup!
before FW 2.80 for 24h arround 7-8%
now with FW 2.80 in 12 hours the same, lost 8%
no worries. regarding music - well - officially it's 10h with gps + music, but from what i've seen that's on the very positive side. actually i'll do a test one of these days...