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SudharsanChandrasekar ya taking whole device backup is not easy for everyone just wait for hotfix update it should come
Phone (2) - Battery Drain Discussion
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I personnaly experienced some battery drain at the begining, but after a few, days, it seems to have stabilized. I wonder if there is not a battery optimization process running somewhere and that it starts to last longer after some days of usage 
My battery life has actually improved after the update significantly
spacexfan Oh yes, it could be that as well.
10 days later
Still no improvements in battery live for my case (Nothing Phone 2), hope that the next update will fix this
Yeah. Its interesting that it feels like even with the screen off, the battery drains just like i would use the phone..
7 days later
"Hey guys,
Is anyone else facing battery drain issues on the Nothing Phone (2) after the OS 3 update? My phone is losing 10-15% charge automatically without even using it.
If you’ve experienced this or know a fix, please share!
Yes i also feel that my screen on time reduced after updating to os 3
RobinYohannan Yepp same on my phone the SOT has greatly reduced.
RobinYohannan I also had this issue, and I changed the preferred network type from 5G to 4G in the settings and the issue was fixed.
SudharsanChandrasekar m also facing same issue battery drain problem after installating os 3.0 using nothing phone 2a
Same problem i faced.
Merged 5 posts from OS3 Battery drain issue..
Merged 13 posts from Battery Drain since Nothing OS 3.0.
Marian-CosminChiriac This is the exact problem. If I use the phone continuously then I shall get great battery life. But if I don’t use it then it drains for no reason.
I am having the same problem on 2a. After the update , I am noticing battery drain when the phone is idle.
If I use the phone continuously, I get screen on time around 6-7 hrs.
But if I do not use the phone that much, the battery still drains with a screen on time of only about 3 hrs.
MahelaMunasinghe last night 3% all night. Nothing Phone 2 just updated to 3.0. for me the battery backup it’s very similar than with 2.6. but the phone smoother.
SrikanthPasupuleti yes battery drain…
@Firmware (bot) When are you going to fix battery drain in current build? Resetting didn’t help.
Got an update yesterday for NP 2, but it still has battery issues
I noticed it’s only draining when I’m using cellular