The main problem for me today is that some updates makes everything go haywire and cause my battery to go from full to empty in 2-4 hours. Normally it can last

The main problem for me today is that some updates makes everything go haywire and cause my battery to go from full to empty in 2-4 hours. Normally it can last for about 48 hours. I have seen this in at least two different Android phones. As I see it they should focus on not making shure there aren't any bugs in Android updates that use the cpu a lot or drain the battery in some other ways. Then they should help with noticing which apps that suddenly drains battery.