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I like Serena
Mar10-12, 11:40 AM
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Short answer, yes, a 3rd party charger that has not been specifically designed for your phone can damage the battery and/or shorten its life.

You may be interested in this section of the wiki article (if you haven't already read it, since the whole article is pretty interesting):
which also refers to another wiki article about USB power and standardization.

Myself, I would use a 3rd party charger only if it is made by or recommended by the manufacturer of my phone.