Oppo R15 Pro has got a 3430 mAh battery with Vooc charging support. It can charge from 0 to 100% in just 35 minutes.
You can see detailed specs here: Oppo R15 Pro
Oppo R15 Pro is around 9k costlier than the Oppo F9 and also offers better features. Oppo R15 Pro has a better processor, more RAM, better camera set and more internal space. Hence, any day Oppo R15 is better than the Oppo F9.
Specs: Oppo F9 vs Oppo R15 Pro
There is much difference between the price of these phones. Specifications-wise the OnePlus 6T is better but the Oppo R15 Pro is also great at its price.
Processor: The OnePlus 6T comes with the Qualcomm Snapdragon 845 processor which is better than the Qualcomm Snapdragon 660 MSM8956 processor of the Oppo R15 Pro.
Camera: The OnePlus 6T has a camera of 16 MP + 20 MP with OIS feature whereas the Oppo R15 Pro has a camera of 16 MP + 20 MP without OIS.
Check Full Comparison Oppo R15 Pro vs OnePlus 6t
The Oppo R15 Pro is a little better as it gives a little better specifications at a similar price.
Processor: The Oppo R15 Pro comes with the Qualcomm Snapdragon 660 MSM8956 processor whereas the Oppo F11 Pro comes with the MediaTek Helio P70 processor.
Camera: The Oppo R15 Pro has a camera of 16 MP + 20 MP with F1.7 aperture whereas the Oppo F11 pro has a camera of 48 MP + 5 MP with F1.79 aperture.
Display: The Oppo R15 Pro has an OLED display which is much better than the TFT LTPS display of the Oppo F11 Pro.
Check Full Comparison Oppo F11 Pro vs Oppo R15 Pro
Oppo R15 Pro comes with a Dual Camera package consisting of a 20 MP+ 16 MP.
The device also comes with 20 MP of front Selfie Camera.
The picture quality of the device is quite nice and detailed.
The device performs quite well during low light images also( Keeping the price bracket in mind ).
In the meantime,do not forget to find all the detailed specifications and other latest updates regarding Oppo R15 Pro here.