The latest version of Android started rolling out to Galaxy S9 and Galaxy Note 9 smartphones in mid-January.
Known as Android 9.0 “Pie” , the update brings a range of new features including a new user interface called “One UI”, digital wellbeing tools, and a new way of displaying notifications.
It also comes with a feature called Adaptive Battery, which uses artificial intelligence to learn how you use your phone, “so the apps and services you don’t use as much aren’t a battery drain”.
But some users of Samsung’s flagship devices are claiming that, rather than saving power, the Android Pie update has decimated their battery life.
The first 9.0 version has some pretty serious stability and performance issues,” wrote one Galaxy S9 user on the Samsung Community forum.
“I STRONGLY recommend waiting for further versions so you would avoid any problems.
“In some aspects, the phone is close to unusable and the battery life is measurably worse after the update!”
Some users have reported that their battery life has decreased by around 50% since installing the update.
I recently updated my S9 plus to the Android pie one UI beta and I must say that the battery life is very very disappointing,” another user wrote.
“I’m getting at least half the performance that I was before when my phone was running on Android Oreo.”
Another wrote: “Ever since the pie update my galaxy S9+ has been running out of juice faster than before the update.
“I’ll go from 100% to 40% in a matter of minutes, I tried everything but nothing seems to work.”
It is not yet clear what is causing the battery drain issue, but it seems to be related to the new One UI interface, which is designed to make it easier to use large smartphones with one hand.
Some users are claiming that the issue settles down after around 10 days, once the new Adaptive Battery technology has learnt your usage patterns.
Others claim that performing a factory reset after installing the Android Pie update resolves the issue, although this has not been confirmed by Samsung.
If you decide to try a factory reset, make sure you backup all the data on your device first, to avoid losing it.