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Well Firstly be very careful when conecting circuits to an expensive phone. and don't try this circuit till one of the expert people here say its ok![]()
You need a low-dropout voltage regulator since your battery is as low as only 7.4V.
Voltage regulators need the input capacitor and output capacitor that are shown on their datasheet.
You need a circuit to disconnect the Li-Po battery when its voltage becomes too low or it will be destroyed. It might even catch on fire.