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Be aware of where you put your iPhone
Almost above all else, keep your iPhone and its internal battery within the operating range, so that it doesn't get too hot or too cold. An iPhone will generate heat depending on what it is being used for, so keeping it at a level temperature is important.
The warmer your iPhone gets, the faster the battery will deplete. Sometimes it's better to keep your iPhone out of your pocket and carry it in your bag — carefully, to ensure the screen or case doesn't get knocked about or damaged — or even clipped to your belt. Some cases will also result in the device getting warm, so choose your accessories and cases carefully.