Charged it an hour ago, so I know the 87% is right, but then it lost power so I plugged it in, showed the red battery thing indicating low battery, then my iPhone 4 booted and I had 2% at that moment. It's accurate because I have BatteryDetective installed and it's accurate within .07%
Holy ****. I don't know what happened.
Holy ****. I don't know what happened.