[Apple iPod] iPod survey for research

These questions are meant for research purposes for a class. A while
ago I posted surveys on Yahoo! Answers and got great results. Now I
am looking for customer requirements for a product I intend to develop
for my engineering class. My question for you is as follows:
In a rechargeable back-up battery for an iPod, what is important to
you? For example you could mention size, weight, charge type, how
long it holds a charge, or cost. Charge type can be solar, wind,
socket, etc.

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