Well .. I took the Touch to work with me... Let it sit ..wifi on ...in a sleep state.. and in the last 6 hours it has dropped from a full charge to 90% So ...unmolested...it should last days ... 2 1/2 roughly... I will turn all the services....and play some streaming audio at 320kbps ... see how it drains... then charge it back up and put some film on it and run the sucker straight and see how fast it consumes battery next... Video tends to be a hog for consumption... I am curious now what the un - optimized extreme will be...for how fast it drains...