You are referring to two different memories. The "Memory effect" [0] is a problem with nickel-cadmium batteries that results in lost capacity when they have be

You are referring to two different memories. The "Memory effect" [0] is a problem with nickel-cadmium batteries that results in lost capacity when they have been partially discharged and recharged. You won't see that in modern cell phone batteries; as far as I know they all use lithium ion batteries. On the other hand, the Apple batteries have circuitry that gives charge information. Supposedly, a complete charge cycle refines its estimates. I couldn't find a mention of this in the online iPhone user manual [1], so I'm not sure how true this is. [0] http://en.wikipedia.org/wiki/Memory_effect http://en.wikipedia.org/wiki/Memory_effect [1] http://manuals.info.apple.com/en/iphone_user_guide.pdf http://manuals.info.apple.com/en/iphone_user_guide.pdf