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this is the battery i want to put in it. http://www.outletpc.com/fr1391.html is it compatible?

Here is the guide to replace it: iPhone 4 Battery Replacement As @benjamen50 said, any iPhone 4 (Take note not 4S, as those are not compatible) will work. iFixit sells high quality replacements, as can be found here: iPhone 4 Battery And while you’re at it, you might want to check out the iPhone 4 liberation kit: [linked product missing or disabled: IF182-019-1] Hope this helps!