The Mi Mix 2S is powered by a 3400mAh battery, which is the exact same battery capacity of the Mi Mix 2. (xda-developers.com)
You pay a little more for the Nexus 10, but you get something that's the same weight, the same battery capacity but far superior when it comes to looking at content. (pocket-lint.com)
Battery, connectivity and OS: Once again, the Redmi 4 and Redmi 3s Prime feature the same battery capacity on both smartphones — which is 4,100 mAh. (bgr.in)