So, i have bought a new battery on ebay for my iPhone 4 for $1.99. (the user had 99.8% positive feedback and it seemed alot better than goin to apple and throwing $80 away). I checked it out on battery detective and it says that the charge is 99.56% and my old battery only held 89%. The cycle count was only 2. But the battery is dying fast. What could be a problem if it is brand new???