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The Guardian reports that Apple engineers are contacting iPhone 4S customers who are reporting a dramatic drop in battery life.
When Apple had unveiled iPhone 4S, it had claimed that the new iPhone comes with slightly faster improved battery life even though it is powered by a faster dual-core A5 processor.
However, an extensive battery comparison of Apple's new iPhone and iPhone 4 in real world conditions by iLounge had revealed that iPhone 4S battery life is worse than iPhone 4.