If you want to extend the battery life, please drain all the battery power until the phone turns off automatically, then fully charge, and repeat 3-5 times to achieve the best battery use.Package Included1 x 2500mAh iPhone 7 battery1 x Pentalobe (Five-Star) Screwdriver1 x Tri-point Screwdriver1 x Phillips screwdriver1 x Triangle opening tool1 x Suction cup1 x Spudger1 x Adhesive Strips1 x Installation manualNote:1. Please do not use the mobile phone when charging.2. Please kindly check your phone model on the back of your phone before purchasing it.4.If the iPhone unable to turn on after replacing, please re-install all cables and charge the battery then try again. 3. Please discharge the battery below 20% and power off your iPhone before disassembling. The original battery maybe will catch fire if accidentally punctured.