I have one nano clone which averages about 6 hours. For some reason all my other non-nano mp4 players do much better regarding battery life (I have 4 others that average 8-9 hours). The glacier I had before it broke lasted 5 hours before even going down a level on the battery. I never tested the full capacity but I suspect it would have been around 12 hours - and that was with the stock battery!
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