Xiaomi has confirmed that the Redmi 3 will have a 4,100 mAh battery. This confirmation came from the teaser posted on Weibo.
The phone will be thin thanks to the high energy density technology used in the device. The offically confirmed specs looks like this:
5-inch display, already mentioned before 4,100 mAh battery, Snapdragon 616 SoC, 2 GB of RAM, 16 GB internal memory, 13 MP rear camera, 5 MP front camera.
The phone will be released on January 12.