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I bought the sprint Extended battery, the 2100 mHa one. It is sturdy, not like my 6700 extended battey. I hated the expansion battery on the 6700, but this one is much nicer, and the locking mechanism on the cover helps resolve the issues I had with the 6700. It is a good feeling cover, sturdy, and reliable. I get 2-3 days per charge so far, and my old battery was about a day and some with minimal calls. I use exchange, along with other internet apps that poll, so some may get longer life. I don't talk much, so that helps me out, but I don't know what the battery does for a heavy user of voice.
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