Thotakrishnavams , via OnePlus 8 , Nov 16, 2020 : When oxygen 11 updated for OnePlus 8 the battery is draining fast.solve the problem.
Swejuggalo , via OnePlus 8 Pro Ultramarine Blue , Nov 16, 2020 : How fast exactly? Have you checked battery stats and see nothing acting strange?
Snoresville , via OnePlus 8 Pro Ultramarine Blue , Nov 16, 2020 : Also turning the brightness down as low as you are able to see it will help reduce the amount it drains.
Cesard90 , via OnePlus 8 Pro Glacial Green , Nov 19, 2020 : Dark mode can improve battery performance?
CRK1918 , via OnePlus 8 Pro , Nov 19, 2020 : Try to get the Greenify Pro version so you can kill all the background applications in the system and or some you don't use as much（Or you don't need to run on the background.）...and increase the battery performance.See if this help th problem on you phone.Most important is some of the system preinstall apps like Google apps, if you don't need to use it, just disable it completely.
AliAkbar921 , via OnePlus 8 Glacial Green , Nov 20, 2020 : Avoid full cycle (zero-100 percent) and overnight charging. Pull the plug at 80 to 90, as going to full 100 percent when using a high-voltage charger can put some strain on the battery. Keep the phone battery charge between 30 and 80 percent to increase its lifespan This graph explains a bit better what iam trying to say
