This is a import unit & it comes without retail packaging, QC Pass, professional needed for installation. Note : After you installed the new battery Reset / format the phone to sync the battery with the phone. CAUTION : Do not open, crush, puncture. short external contacts or dispose in fire or water. Risk of fire, explosion and burn. Do not open, crush,heat. Compact design, High in quality and stable and performance, Usually takes 2 hours to full Charge with Normal Power Adapter, With Fast Charging Adapter it will take less time. Long power backup around 24 hours with Normal Usage, Provides good talk around 12 hours and standby time around 36 hours approx depend upon Background app, Overall Good performance.