This replacement battery is what you need to bring that dead smartphone back to life. This battery is brand new! Each one has been tested to confirm that there are no cycles on the cell and that the capacity is 95% or higher. PART ASSEMBLY INCLUDESNew Replacement Battery Compatible with iPhone 8 PlusBattery Adhesive Strips NOTEFor optimal performance, calibrate your newly installed battery: Charge it to 100% and keep charging it for at least 2 more hours. Then use your device until it shuts off due to low battery. Finally, charge it uninterrupted to 100%. WARNINGLearn more about safe lithium-ion battery handling and proper disposal. COMPATIBILITYThis part is compatible with iPhone 8 Plus. SPECIFICATIONSWatt Hours 10.28 WhVoltage 3.82 VMilliamp Hours 2691 mAh Warranty1 year Warranty Installation In store install is $15 with a 30-minute install time.