The Pixel 3 battery is 2915mAh and the Pixel 3 XL is 3430mAh. It supports up to 18W fast charging and supports Qi wireless charging. The box comes with an 18w/2A USB Type-C charger, a USB-C to 3.5mm headphone adapter, a USB-C to USB-C cable, and a Pixel USB-C earphone.
