Battery Life?

i got new ipod touch 4g , updated newest version of ios. know devices not there rated battery life, touch doesn't seem anywhere near rated 40 hours audio.

unplugged night before after charged , next morning took me school , time got home night getting "less 20% battery left" message.

used music, on , off of day. wifi on whole time maybe why , did play games bit.

normal battery behaviour or there wrong battery?

sorry thread battery life.

 

make sure bluetooth off.

games kill battery .

 

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