E-YIIVIIL battery is compatible with Google Pixel XL 1st 5.5-inch.We provide tools for installation, no instructions included. You can find some instruction videos on YouTube or find a technician if you don't know how to replace the 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 and be sure to check if thecable has been properly connected.All the batteries have been tested before shipping out and come with repairing tools for installation.Part No: B2PW2100Capacity:3450mAh /13.28WhVoltage: 3.85VType: Li-ion PolymerA new Li-ion battery will achieve its best performance after 2 or 3 complete cycles of charge & discharge.Do not use low quality third-party adapter charger to charge your device, which will shorten the battery's life.E-YIIVIIL offers a 6 months Warranty.