The Product which you can see is iPhone 6S Plus Battery .
iPhone 6S Plus Battery is a high quality and affordable part.
If your iPhone 6S Plus battery dies so fast When you notice that doesn’t give battery life then new battery installations is pretty reasonable, and certainly much cheaper than buying a new phone. Replace it with below Product.
iPhone 6S Plus Battery is designed to work perfectly.
The image below use to present product is just for reference
Actual product will be different from image.