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discussion] iPhone 4 shows 100 percent battery but shuts off when you disconnect the power cable : r/LegacyJailbreak
How to Improve iPhone 5/4S/4/3GS Battery Life
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Get a More Accurate Battery Status - The iPhone Book: Covers iPhone 4S, iPhone 4, and iPhone 3GS, Fifth Edition [Book]
How to show battery as a percentage on the iPhone 4S - YouTube
