The battery measurement software will never work again with any third party battery replacement. You will never know your actual battery value and the phone may shut off when there is plenty of juice available. Also Apple has software to detect if any part of the phone is replaced and will refuse repairs if any part is replaced. I was told this by the Best Buy authorized repairman as he spent 20 minutes checking my phone and I was told not to leave because they would refuse the repair if my phone had been touched!