[Q] [Help] Battery Drops to 1% from 20%[KK ST18i] topic

My Xperia Ray Running on Kitkat 4.4.4 is facing a sudden battery drain. When the battery is about 20-25%, It suddenly drops down to 1%. :crying:
Is there any method to solve this?
I had tried flashing the ICS firmware. and again flashing the Kitkat Kernel. This did not fix the issue.
Can anyone suggest a fix for this?

[Q][KK St18i] Enable HDR, Panorama and Other features on Google Camera topic

I am Using Xperia Ray [ST18i/Urushi] with a Kitkat - 4.4.4. But there is no Photo Stitching, HDR+ options available.
Also I have been searching for CyberShot Superior Auto for kitkat. which is also not available.
Is there any way to fix this?
Kindly Help Me
Thanks