If you put everything off what is point of having a mobile right. Something is using your battery at background. Check and put all background apps off. If you get opportunity to talk to Samsung do that.
it's started happening the new android 10 update... i think it's software issue... i don't have many apps maybe 20 apps.. i disabled Facebook..... still no matter what battery life is around 6.5 hours... with same usage... on Android pie.. it was 8 to 9 hours....
If you are getting 0.5% to 1% per hour battery drain during standby it is fine. Exynos processors are known to have higher standby battery drain than Snapdragon processors probably because of the differences in modem. If reception in your area is low it will result in higher battery drain. You can try switching jio off for one night and monitor the battery drain. If the phone loses less battery, you will know the culprit. My phone loses about 6% in 8 hours overnight with Jio and Airtel both on lte and wifi, mobile data and location on. However I have kept a lot of apps from which I don't any notifications to deep sleep and I have restricted location permission only to 2 or 3 apps.
Bro read my post carefully, I mentioned i tested this with all possible ways. I turned off almost all the settings . I'm using jio and airtel. I keep airtel always on 2G network and always turned off volte. there is no signal drop in my area. I used lot of exynos device. I used s7 edge also which the exynos. I tested it. it reduces just 3% in 8hours Standby.
again all members, I tested all the ways to improve battery performance.