> Does using your phone with the charger/AC conserve battery life as it is my understanding that it is the charge cycles that use up the battery?
A lot of people have bad memories associated with the old NiCad batteries, which did have a memory effect. The battery chemistry in an iPhone is LiIon - which is a completely different technology with its own peculiarities.
The main enemy of LiIon batteries is heat, get them too hot and it hurts their life. Unlike NiCad, which had a cell voltage of 1.2V, NiMH which also has a cell voltage of 1.2V, and alkaline with a cell voltage of 1.5V, the cell voltage of a LiIon battery is around 4V. Fully charged it can be 4.2V, fully discharged is about 2.5V. If you ever fully discharge a LiIon - it is destroyed. Fortunately, the iPhone and other devices that use this battery chemistry have sophisticated electronic controllers to prevent that from ever happening - they will tell you the battery is "dead" long before it discharges to that 2.5V level.
You will NEVER see stand alone LiIon batteries for sale in the store, only battery packs with the electronics built in, and terminals that can't be easily shorted. A LiIon battery, if fully charged, can be very dangerous. If shorted, it can achieve temperatures similar to molten lava - meaning if your LiIon powered iPhone or any other device with that type of battery starts overheating, your safest recourse is to place it on a concrete surface and back away. That is a VERY rare occurrence, though, because most LiIon batteries have a fuse built in as a last resort safety keeping a short from happening. The very few incidents of meltdown have been the result of multiple failures of safety systems simultaneously - statistically very rare. The people that put the iPhone in the blender, however, were extremely foolish because that is probably one way to cause LiIon shorts and catastrophic melt down, not to mention the release of all kinds of toxic substances.
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