Answer to "Replaced iPhone4 battery. Now randomly restarts and battery % broken!"I replaced my battery and had the same problem. But I did resolve it. After I installed the new battery I turned it on. Then I held the sleep button and home button at the same time. I ignored the slide to turn off. Continued to hold it till the apple logo reappeared (took about a minute). This is performs the function of a reset which is not the same as just turning it off and back on.