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Apple has invested millions of dollars in battery research and development for their products. This research has led to them installing the maximum capacity battery given the pre-defined amount of space available in each iPhone. There are batteries on the market that claim 1600mAh however the battery size is identical to the OEM battery. Furthermore, when testing these higher capacity batteries they perform equally or less to the OEM sizes. There was one model that did not include the system board connector so you literally had to unsolder the connector from the old battery and solder to the 3rd party battery (see image below).
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