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It does appear to only last around 10/12hrs in normal use (audio)
Past Sony players really did deliver on the promised battery life, with the NWZ-A845 it's one lie after another.
My battery also lasts much less than my previous NWZ-639, just make sure it is off properly when you aren't listening, turn off the battery care function and buy a mains charger off ebay, at least you can listen while charging, unlike the USB lead.