This phone from OnePlus has a large 4,500 mAh battery. This model is equipped with an octa core processor to be able to handle all the heavy apps.
From Amazon
OnePlus 9 5G (UK) SIM-Free Smartphone with Hasselblad Camera for Mobile - Arctic Sky 8GB RAM 128GB [UK version]
OnBuy
OnePlus 9 8+128GB Blue Dual SIM Smartphone European Version