I'm not sure you noticed but people are saying in their reviews that they last as long as the stock battery. Since the stock battery is 2100 mAh, my point is pretty much proven.
Why would I be paying for a battery? My phone came with one.
What point did you prove?
Why did you click on this the first time if you don't need one?
I'm not sure if you noticed but sometimes people need more battery life then the stock battery provides, and they don't always have access to a charging device. So when you have two batteries you can switch them out when one gets low, and guess what happens? You get to use your phone longer!
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