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Original topic:

Battery drain after the last security update (September update) on S21

(Topic created on: 16-10-2021 05:12 PM)
Michael2103
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Galaxy S21 Series
Is anyone experiencing the same issue as the title suggested? It's been more than three weeks now and my battery is getting worse after the last security patch/update pushed in September. 
I am fed with Samsung phones.
The battery used to last about 18hours on battery saving mode and 12 on optimised. Now I can't make it through 8hours both on optimised and battery saving mode.
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12 REPLIES 12
xSteveuk
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Galaxy S21 Series
Hi,
Since your last system update
Have you tried deleting
The cache
This can helpful deleting temp
Files that are no longer needed

https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/
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Michael2103
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Galaxy S21 Series
Thank you for that. I sure have. Cleared the cache and had to delete most of my apps just to make sure.
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xSteveuk
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Galaxy S21 Series
On settings Display
Have you got Adaptive brightness turned on as that can drain battery try Turning it off
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Michael2103
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Galaxy S21 Series
Okay, thank you for that. I have now
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Niknak31
Journeyman
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Galaxy S21 Series
I'm having the same issues and have done all of the above. Can't even get through a day at work without the battery going completely, really weird as I don't use it that much.
Michael2103
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Galaxy S21 Series
In idle mode the max I can squeeze out of it is 6 hours and that happens after I've turned off location and auto sync. It's getting ridiculous now with these so-called security updates
Niknak31
Journeyman
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Galaxy S21 Series
I got rid of my s20 FE for the s21 and the battery life on that was amazing, wish I hadn't swapped now.
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Michael2103
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Galaxy S21 Series
That phone for me was a beast. I am hoping the s22 will be a much better phone, else I am switching to an iPhone 13 Pro Max
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debs13
First Poster
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Galaxy S21 Series
Hi.
I did a security update 21st October on my S21 plus and my battery life is depleting alot quicker than before update.
I have again cleared cache and all the other options suggested and nothing solves the issue.
It's so frustrating.
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