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Embedded battery or removeable AA or AAA cell?

Subject: Embedded battery or removeable AA or AAA cell?
It's unusual to find an MP3 player with battery life shorter than 15
hours, which will be long enough for several days in the field.  Most
players use some sort of battery that is not replaceable.  These
players recharge from mains power via a transformer, or increasingly,
from your PC via the USB port.

A few Flash players use a removeable AA or AAA cell.  This can be
useful in the field, especially on longer trips.  Such a player is
usually larger and heavier by a small amount.


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