His tweet that the OnePlus 9 and 9 Pro will pack a 4,500mAh capacity battery. It was rumoured that OnePlus might follow the same trend of not including the charger in the box. But, the tipster has made this clear. In reply to a user asking about the in-box charger, Max confirmed that OnePlus 9 series will include a charger in the box.
— Max Jambor (@MaxJmb) February 9, 2021
The batteries of OnePlus 9 and 9 Pro is most likely to use dual-cell technology to provide fast charging. Though the charging speed is currently unknown, recent leaks suggest that it may support 65W fast charging.
As per a recent leak, the OnePlus 9 Pro will feature a curved display with QHD+ 3120 x 1440 pixels resolution and a 120Hz refresh rate. It will come with a quad-camera module with Hasselblad branding. Rumors are rifle that OnePlus 9 will launch in the next month, i.e March 2021.