September 19, 2013
Screenshots of the iOS7 are seen on the screen during Apple Inc's media event in Cupertino, California September 10, 2013. REUTERS/Stephen Lam
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Apple said "a very small percentage" of iPhone 5 smartphones may "suddenly experience shorter battery life or need to be charged more frequently."
Apple Inc said it sold 9 million iPhone 5s and iPhone 5c models in the first three days after their launch on Friday.
The fingerprint reader on Apple Inc's top-end iPhone 5S received an early thumbs up for ease of use from two influential reviewers, helping dispel concerns about the scanning technology which has been notoriously unreliable in other cellphones.