10) isn't
quite right. Although draining the battery won't (in fact) increase battery life, it will recalibrate the iPhone so it accurately displays the true battery life. This can help to keep it from appearing that the battery is draining too fast.
Although this paragraph from
batteryuniversity.com seems to agree with your point:
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Originally Posted by www.batteryuniversity.com
A lithium-ion battery provides 300-500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. There is no concern of memory when applying unscheduled charges.
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It goes on to explain the importance of calibration:
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Although lithium-ion is memory-free in terms of performance deterioration, batteries with fuel gauges exhibit what engineers refer to as "digital memory". Here is the reason: Short discharges with subsequent recharges do not provide the periodic calibration needed to synchronize the fuel gauge with the battery's state-of-charge. A deliberate full discharge and recharge every 30 charges corrects this problem. Letting the battery run down to the cut-off point in the equipment will do this. If ignored, the fuel gauge will become increasingly less accurate.
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