Lenovo Vibe X3 is the best mobile under under Rs 25, 000 in India. You can buy it from Amazon at Rs 19, 999
Battery: Superb battery backup 3500 mah Li Po battery with talk time of 31 hrs on 2g.
Camera: 21MP primary camera with dual LED CCT flash and 8MP front facing camera
Processor, Storage and Ram: Snapdragon 808 hexa core processor, Adreno 418 GPU, 3GB RAM, 32GB internal memory expandable up to 128GB, Hybrid Dual Nano standby Sim
It comes with Theatermax technology and Dolby Atmos Speakers. It is a beast under Rs 20, 000!