Compatible phone model: This battery kit is only compatible with the Pixel 4, and is NOT work with the Pixel 4 XL or 4A series. Please verify your phone model before making a purchase. High-quality Li-Po cell: Featuring a brand new, zero-cycle original Li-Po cell, this battery is manufactured and tested to meet UL2054 standards, ensuring excellent performance and durability. Important: To achieve optimal calibration, a new battery should undergo at least three full charge and discharge cycles. Original back cover adhesive included: The battery comes with a pre-installed adhesive—just peel off the protective film and firmly press the battery into place for straightforward installation. The package also contains a pre-cut adhesive for the back cover, enhancing convenience. Comprehensive repair guide: A detailed repair guide is included in the package, providing you with the information needed to confidently carry out the repair on your own. Upgraded Li-ion Battery for Pixel 4, New 0 Cycled Replacement Battery Compatible with Pixel 4, Includes Instruction & Tools