Advice on what's hogging my battery and zapping it at 50ish % - ZTE Axon 7 Questions & Answers

Hi. I'm on the B03 build of Oreo non rooted. Had to manually find the download as bought phone from Italy and imported to UK.
Really like Oreo but since getting it, my battery has been cutting out at around 50% sometimes lower. There is something in the battery life that is hogging it but it doesn't say what, just the android symbol at 86%.
Would a new battery fix this or is it time for a new phone? I've only had this 2 years and most phones I've got 4 years out of. Love the hardware but it's been a bugger for lack of support and no OTA updates.
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Related

[Q] some problem at I9300

Hi all omni is my 1st custom rom and i like this rom very much but now i found so problem on my phone
my device - philz_touch_cwm6/omni 4.4 latest build
1.Portable hotspot- i switch it on but my tab cant find my wireless network
2. camera will hang
3.battery life drain faster then old stock rom. my friend intro me and he also using this omni 4.4 but his battery 40% can last for 11hour
my battery 80 % last for 4 hour only
sorry for my bad english.
upload some pic for refrence
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As to battery - you were playing Ingress... duh........
Tethering is a known issue, unfortunately most of the people with experience diagnosing tethering issues don't have I9300s.

Sudden Battery Impact

Battery problems are a dime a dozen, I know, but this one cropped up in the last few days and I want to check if it's affecting anyone else.
I have a stock, 5.0 I-9505G, and the kernel (Android OS) and Android System have spiked in usage the past week. I suspect it's connected to a Google Play Services update, but I haven't seen other reports on it.
Anyone else's stock kernel acting out? What would your all recommend?
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It's caused by an app, some setting in your phone etc. If you can't figure it out, then try a factory reset.

Note 4 N910C very bad battery life

I'm running on 5.1.1 COJ5 latest for my country:
http://www.sammobile.com/firmwares/download/60110/N910CXXU2COJ5_N910COXX2COJ2_VIM/
So if you are on a stock firmware and you have good battery life i would love it if you told me what your version is so I can try it out. Or maybe if you have other suggestions.
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Mybattery is similar to your issue I'm going to root my device this week and use a custom Rom but I'm told by many people to replace battery and don't use diffrent kind of chargers. I hope someone know the best way to keep this phone running cool and processing values decrease when focusing on 1app like reading in appygeek so battery extends longer. I'm pretty sure this can stay a full day if just browsing, reading and phone calling, chatting and some small video clips in whatsapp. Because right now I'm charging phone 2wice a day fullcharge. Zzzzz

Android OS battery Drain

I used to have around 6 hours Screen on time with around 20% left per day, now I barely past one hour and a half screen on time and my battery is at 50% , I can see that " android os" is using my battery quite extensively , the only thing I tried is deleting the cash and disable some automatic sync, can someone suggest a solution ? and can you please share how much android OS uses of your battery (in mAh) ?
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Phantom battery drain

I'm running LineageOS 20 (Android 13).
Charged my phone to 90% 2 days ago, left it on standby afterwards.
The battery was replaced 3 months ago, and the phone does not heat up during normal use.
Came back to 15% battery remaining.
Anyone knows what's going on? Is the battery fake or something? How do I even start debugging this problem?
Other than the stock apps installed alongside the ROM, I have rooted the device with magisk and installed Adaway and Advanced charging controller.
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