This battery is compatible with Google Pixel 1st 5.0 inch, can replace your old battery, please check your phone model before purchase. we provide tools for installation, no instructions included. You can find some instruction videos on YouTube or find a technician to help if you don't know how to replace your battery.When you replace your old battery, please carefully and gently disconnect your old battery's cable then connect your new battery to the mainboard.If your phone cannot be powered on with the new battery, you may need to install it again andbe sure to check if the cable has been properly connected.All the batteries have been tested before shipping and come with repairing tools for installation. Do not use low quality third-party adapter charger to charge your device, which will shorten the battery's life.Part No: B2PW4100Capacity:2700mAh /10.66WhVoltage: 3.85VType: Li-ion PolymerA new Li-ion battery will achieve its best performance after 2 or 3 complete cycles of charge & discharge.E-YIIVIIL offers a 6 months warranty.