Active Level 5
I have seen a downgrade in battery charging performnace and drainage after update in galaxy note10 plus ...earlier the battery use to get charged 100% in just 1hr and 3mins but after the update of one ui2 and security patch...it takes 1 hr and 13 mins to charge 100% .

Also, i have seen the drainage issue in my device ..the battery does gets drained bit faster than earlier ...i think upgrades are given to the devices in order to keep the device to its optimum level to deliver its best performance...but i think samsung has understood the other way round ...to decrease the performance through updates...