S21 Ultra battery life issues

[Chrisharry]

Hi all I'm having issues with my battery. I have had the phone 3 days and have imported my apps etc from old phone. Its lasting about 10 hours with it predicting to do so today as well. I'm down at 79% after taking it off charge less that two hours ago and barely using it.

I saw a similar post suggesting to reset the cache but it just isn't working.. I have watched 3 videos on how to do it, I follow them step by step and it just reboots my phone normally..

On the battery stats it says chrome is the biggest culprit. I use chrome for work and has all my shortcuts etc save so I really don't want to switch as I should be able to use the browser I choose without issue. I have upgraded from the p30 Pro and usually get a full day out of it every time and that's with heavy use...

Is their a known error/ fix as I'm about ready to send it back.

I'm using the same charger I used for the p30 Pro since Samsung didn't even provide one for this phone..

[MM3301]

Im having the same issue with my normal s21. After the recent update. Battery life is awful and sometimes i wont fast charge

[JAMES4578]

@Chrisharry @MM3301 For the beat results you really need a 25 watt charger (the only one which will support Super Fast Charging) . Samsung's official charger  I think is the best choice  but other alternatives here  https://www.xda-developers.com/best-galaxy-s21-fast-chargers/amp/ 

@Chrisharry Does seem to be an issue if losing that much charge with little activity. Usually wiping cache partition and if necessary a factory reset (after backing up) solves many problems. Unfortunately chrome at the moment is a well known Battery Hog though.

I received the S21 Ultra this week,working well so far.

[AndrewL]

@Chrisharry: I'm sorry to hear that you're experiencing this issue. Please can you take a look at the steps below in an effort to improve your overall battery life? 

- Shut down all background apps when not in use via the Recent Apps button
- Settings > Connections > More Connection Settings > Nearby Device Scanning > Off
- Turn off Wi-Fi, Mobile Data and Bluetooth when not in use
- Head to Settings > Battery and Device Care > Battery > Power Saving Mode > On, and check the additional options below
- Go back and select More Battery Settings > Adaptive Battery > On > Enhanced Processing > Off.

[Pugs1957]

Chrome is a problem across ALL devices since the last update. You will fare no better with other manufacturers, the app is the problem not your phone.

[Chrisharry]

Yet it causes no issues with my p30 Pro so I don't think chrome itself is the issue.

[Chrisharry]

Just a shame they don't provide one despite being the most expensive phone on the market.. I currently use a 30w ravpower charger

[Chrisharry]

Is there another way to clear the cache apart from power off then hold volume up and the power button as that's doing nothing

[JAMES4578]

@Chrisharry With Android 11 you need to connect to computer or use USB C Headphones. Are you using any of the optimisation techniques? Can see more in this thread https://eu.community.samsung.com/t5/discussions/s20-plus-android-11-recovery/td-p/2390625 

[Mishal]

Hi Chrisharry, inorder to get your phone to boot to recovery mode you will have to connect it to a computer or USB C headphones firs then do the poweroff and holding volume up and power button.