Answer to: iPhone 4 battery life short AFTER replacementI have the exact same pattern and results. iPhone had good battery life, then one day last week, would not last much more than a few hours. Installed new Battery last night (thanks iFixit.com). I let the battery fully charge over night. Removed from charge at 7am and by 12pm it was down to 5% with minimal use. Closed all applications this morning before heading out so I'm confident that only a hand full of apps have been running. What is the next thing to check or that would be causing the battery to run down so quick?