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turn off location services, background refresh, email change to manual, etc...
You can charge your iphone for another 45min after it reaches 100 it will last longer. Typical battery drop in airplane mode is 3-5 hours per %, but it takes almost 1 day to go from 100 to 99. This I have tested on 4S (7.1.2, 9.3.5), 5S (7.1.2), SE (11.4.1) and 8 (11.4.1).
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