I updated my OnePlus One phone to the company-owned system, Oxygen OS. The battery now is miserable - it depletes within 5 hours. I am looking for a solution to fix that without wiping and reinstalling another OS. I read that installing a different kernel can solve such an issue. I flashed many ROMs on many devices previously, but never updated a kernel. What I will lose if I did it? What is the best way to update the kernel?