I replaced the battery in my iPhone 4S with a $9 ebay cheapie last night. It was meticulous work, and I even bought a cheap magnification visor to enable me to see the tiny screws. But it was fairly easy. Charged the phone overnight, and the battery is performing really well this morning. My contract is up in January so I had to make this phone last until then. The original battery was basically shot. It would give me a day in standbye, or about 45 minutes of use. The new battery has given me 45 minutes this morning and is at 97%.
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