Question ROM with best battery backup. - OnePlus 9R

I'm currently using Nameless AOSP latest build but its battery backup is not that much good.
Can you share your experience on OOS 12 or any other ROM having good battery backup with gaming also.

what do you mean by battery backup ? you mean this ?
"A battery backup is a system in some power supplies that switches between a main power source and a battery"

Fytdyh said:
what do you mean by battery backup ? you mean this ?
"A battery backup is a system in some power supplies that switches between a main power source and a battery"
Click to expand...
Click to collapse
I mean on which rom you get max time with single charge.

i see. the problem is that gaming is the one at fault here for draining your battery. the screen uses the most. plus it matters what are you gaming. for example, for me, on stock i get 2 days when playing games. but i am playing sudoku and chess.

Related

gaming massive battery drain!!

i have the elegant white rom,its awesome low ram consumption speed etc.
BUT first to change stock rom(original from manifacturer)i could play 2 hours and 1/2 sometimes 3 without trouble with battery at 30/35% left now i play 5 mins and my battery goes from 93% to 87% in 5 min
so 6%x12=72%battery lost in 1 hours its bad really bad! i also installed the battery fix but notthing!in idle without playing i lost 2/3% per hours so this is good.
someone have my same trouble? it is normal?if so i should install back stock rom?
if i get stock rom again the battery should be fine?
the elegant rom is on stock 2.3.7 i had 2.3.3 when i bought this phone
sorry for bad english i have not much time
thx everyone
(already done calibration)
to full charge it takes 1 hours max is it normal?
cech12 said:
i have the elegant white rom,its awesome low ram consumption speed etc.
BUT first to change stock rom(original from manifacturer)i could play 2 hours and 1/2 sometimes 3 without trouble with battery at 30/35% left now i play 5 mins and my battery goes from 93% to 87% in 5 min
so 6%x12=72%battery lost in 1 hours its bad really bad! i also installed the battery fix but notthing!in idle without playing i lost 2/3% per hours so this is good.
someone have my same trouble? it is normal?if so i should install back stock rom?
if i get stock rom again the battery should be fine?
the elegant rom is on stock 2.3.7 i had 2.3.3 when i bought this phone
sorry for bad english i have not much time
thx everyone
(already done calibration)
to full charge it takes 1 hours max is it normal?
Click to expand...
Click to collapse
You need to calibrate your battery (and/or delete your battery stats)
Soeskip said:
You need to calibrate your battery (and/or delete your battery stats)
Click to expand...
Click to collapse
i said:already done
done 2 days ago after let phone shut down and charged until 100%
Roms based on CM7.2 do drain battery massively compared to stock so going back to stock would help.
Battery callibration does not help - see Here
Same problem here... Living with it cuz stock has just become old and lazy
But if you really want battery switch to stock its way better than cm
[practice random acts of kindness and selfless acts of love]
cech12 said:
i have the elegant white rom,its awesome low ram consumption speed etc.
BUT first to change stock rom(original from manifacturer)i could play 2 hours and 1/2 sometimes 3 without trouble with battery at 30/35% left now i play 5 mins and my battery goes from 93% to 87% in 5 min
so 6%x12=72%battery lost in 1 hours its bad really bad! i also installed the battery fix but notthing!in idle without playing i lost 2/3% per hours so this is good.
someone have my same trouble? it is normal?if so i should install back stock rom?
if i get stock rom again the battery should be fine?
the elegant rom is on stock 2.3.7 i had 2.3.3 when i bought this phone
sorry for bad english i have not much time
thx everyone
(already done calibration)
to full charge it takes 1 hours max is it normal?
Click to expand...
Click to collapse
Battery Calibration has nothing to do with battery life on any ROM.
Source: XDA-Developers Battery Callibration Myth Debunked
008bond said:
Battery Calibration has nothing to do with battery life on any ROM.
Source: XDA-Developers Battery Callibration Myth Debunked
Click to expand...
Click to collapse
if i switch back to stock manifacturer rom it should be fine or not??
cuz if so ill get it back
elegant white is based on 2.3.7 not on cw(i have just cw console)
cech12 said:
if i switch back to stock manifacturer rom it should be fine or not??
cuz if so ill get it back
elegant white is based on 2.3.7 not on cw(i have just cw console)
Click to expand...
Click to collapse
theres a lot of stock rom base try it...
go back to stock rom...stock roms are the best!!
ace-user said:
go back to stock rom...stock roms are the best!!
Click to expand...
Click to collapse
umm is there a different battery life between
2.3.3 and 2.3.7?
I'll try to install stock rom.I'm doing a test with my friend's phone stock rom no Root my battery has more life with wifi and browsing.didn't try with gaming yet
more performance,less battery life
Sent from my GT-S5830 using xda premium
sunnyfok said:
more performance,less battery life
Sent from my GT-S5830 using xda premium
Click to expand...
Click to collapse
Any difference between 2.3.3 .5 .7 ?
which of these has more life?
cech12 said:
Any difference between 2.3.3 .5 .7 ?
which of these has more life?
Click to expand...
Click to collapse
There isn't a noticeable difference in both versions in terms of battery life. However, 5.7 has better performance and is noticeable.
You can try underclocking to something like 730 MHZ and save a decent amount of battery life without losing performance. Check this OC kernel out:
OC zImage
Also, use Cyanogenmod, ADW launcher without customizations is faster than the stock touch-wiz UI launcher.
008bond said:
There isn't a noticeable difference in both versions in terms of battery life. However, 5.7 has better performance and is noticeable.
You can try underclocking to something like 730 MHZ and save a decent amount of battery life without losing performance. Check this OC kernel out:
OC zImage
Also, use Cyanogenmod, ADW launcher without customizations is faster than the stock touch-wiz UI launcher.
Click to expand...
Click to collapse
I just want to have a long life of battery so ill come back to stock .7
For all those who r shouting that battery calibration doesnt improve battery.. Did the XDA said it improves battery life?? Do u ppl know wats the meaning of calibration?? Calibrating means adjusting something to the accurate value.. Not improving the value!! Even we never said it ll improve battery life.. Battery calibration just calibrates the reading to more accuarte one. So let the ppl calibrate it. Else leave. It ll automatically gets adjusted after 1 or 2 week.. U can see urself the change..
Prashanthme said:
For all those who r shouting that battery calibration doesnt improve battery.. Did the XDA said it improves battery life?? Do u ppl know wats the meaning of calibration?? Calibrating means adjusting something to the accurate value.. Not improving the value!! Even we never said it ll improve battery life.. Battery calibration just calibrates the reading to more accuarte one. So let the ppl calibrate it. Else leave. It ll automatically gets adjusted after 1 or 2 week.. U can see urself the change..
Click to expand...
Click to collapse
Yes, many members on XDA said that callibration improves battery life. The battery indicator on your status bar does not use batterystatus.bin. It does not automatically adjust after 1 week or 2. It re-calibrates every time you charge!
Read the article posted by XDA for more:
google-engineer-debunks-myth-wiping-battery-stats-does-not-improve-battery-life/
well i dont know about you all
but on my phone battery percantage isnt that accurate
cause when i unplug phone from charger and just open game or do something battery percantage goes to like 90%
but when my battery percantage is low like 18% it holds 30mins on 18%
I've tested many roms here and stock rod do tend to have better battery life, but... When i tested the RAZRv3 by TeamCooper, it had extremly good battery life.
When i got my Ace it had froyo, that lasted about 2.5-3 days. I upgraded to gingerbread official, battery lasted about 1.5-2 days on. Then i tried several custom stock roms and they all lasted about 1-2 days.
After that i started testing CM7 (both 7.1 and 7.2) roms and most of them lasted 12-18 hours (i used the wifi disables 3g function and some other tweaks to last the battery longer otherwise those roms would not have been usable)
Then i got to the RAZRv3 i used it for 2 weeks and the battery was amazing, it lasted easily for 3 days with no other tweaks than "wifi disables 3g" and also the performance was good. No lag!
Then i tested the CM7.2byFAT and the battery was awful but i really liked the rom so i keep 3g disabled when i dont use internet (all background apps use 2g internet) and now the battery last for 2 days.
As i've tested.... 3g takes really alot of battery in CM7 roms but in RAZRv3 (cm7.1 based) it worked like a charm.
So.. Everyone who wants really good battery life should test RAZRv3 that can be found here: http://forum.xda-developers.com/showthread.php?t=1478807

Worst battery life!!!

I have tried several ROMS, MIUI, stock 4.1, 4.2, Samsung and xperia mods.
None of the ROM provides better battery life, which mean there is some problem with the kernel and Mediatek libraries.
Usually phone is @ 60 % before i go to sleep and in approx 8 hours battery drains to 30, Data, GPS, Sync are switched off, no apps running, there is a continuous 4-7% drop in battery percentage.
Worse is when i play ingress on my phone battery drops by 40% / h, i have an app BatteryDrain which tells the approx hourly drain.
Are you all facing similar issue. can you guys please share the screen shot of battery drain.
Okay.... I will give u the solutions in increasing order of intensity..
1)check auto brightness off
2) go to settings and check battery statistics.... Force stop / Uninstaller any app if it consumes to much battery
5)go to developer settings and click on don't keep activities.. Also delete battery stats in Cwm recovery ( not responsible for Wierd stuff which might happen)
4) install greenify , and hibernate apps....
6) install juice defender ( my battery life is doubled )
7) flash pure performance(look in general section) remember to backup. ( not responsible for damage)
7) take the backup of ur rom and reflash stock 4.2.1 ( not responsible for damage)
8) it might be something wrong with ur battery... So go buy another genuine CHD battery or steal it from ur friend
9) Go to service centre and show them how bad the device battery is.... If u have Warrenty ur in luck
Sent from my Micromax A116 using xda premium
eagledipesh said:
I have tried several ROMS, MIUI, stock 4.1, 4.2, Samsung and xperia mods.
None of the ROM provides better battery life, which mean there is some problem with the kernel and Mediatek libraries.
Usually phone is @ 60 % before i go to sleep and in approx 8 hours battery drains to 30, Data, GPS, Sync are switched off, no apps running, there is a continuous 4-7% drop in battery percentage.
Worse is when i play ingress on my phone battery drops by 40% / h, i have an app BatteryDrain which tells the approx hourly drain.
Are you all facing similar issue. can you guys please share the screen shot of battery drain.
Click to expand...
Click to collapse
Yes I have the same issue what do u have Now, as soon as my battery reaches to 30% my phone gets switched off,
I have tried all ROM but having same issue,
I have flashed Stock 4.2.1 ROM of My phone 919 but same issue,
So what I did I have just replaced my battery with one my friend who is having same Canvas CHD phone, Now I don't have any Battery issue.
And strange thing is My OLD battery is working very good on my friends Mobile,
So he is also not having any battery issue
He is on SamHD and I am on Stock 4.2.1 ROM
So my advice is,
Just try to use On stock ROM for few days you will back to Good Battery Life
Sent from my Micromax A116 using xda app-developers app
eagledipesh said:
I have tried several ROMS, MIUI, stock 4.1, 4.2, Samsung and xperia mods.
None of the ROM provides better battery life, which mean there is some problem with the kernel and Mediatek libraries.
Usually phone is @ 60 % before i go to sleep and in approx 8 hours battery drains to 30, Data, GPS, Sync are switched off, no apps running, there is a continuous 4-7% drop in battery percentage.
Worse is when i play ingress on my phone battery drops by 40% / h, i have an app BatteryDrain which tells the approx hourly drain.
Are you all facing similar issue. can you guys please share the screen shot of battery drain.
Click to expand...
Click to collapse
You should flash pure perfomance and also try pimp my rom both of them are available in the general selection(remember to take backup). These tweaks will increase your device's perfomance and also increase the battery life.. It helped in my case
Thank you for replying, for now I have installed juice defender and greenify, will share the results.
Sent from my Micromax A116 using xda app-developers app
Ryan Dey said:
You should flash pure perfomance and also try pimp my rom both of them are available in the general selection(remember to take backup). These tweaks will increase your device's perfomance and also increase the battery life.. It helped in my case
Click to expand...
Click to collapse
Anands3 said:
Yes I have the same issue what do u have Now, as soon as my battery reaches to 30% my phone gets switched off,
I have tried all ROM but having same issue,
I have flashed Stock 4.2.1 ROM of My phone 919 but same issue,
So what I did I have just replaced my battery with one my friend who is having same Canvas CHD phone, Now I don't have any Battery issue.
And strange thing is My OLD battery is working very good on my friends Mobile,
So he is also not having any battery issue
He is on SamHD and I am on Stock 4.2.1 ROM
So my advice is,
Just try to use On stock ROM for few days you will back to Good Battery Life
Sent from my Micromax A116 using xda app-developers app
Click to expand...
Click to collapse
androidpratik said:
Okay.... I will give u the solutions in increasing order of intensity..
1)check auto brightness off
2) go to settings and check battery statistics.... Force stop / Uninstaller any app if it consumes to much battery
5)go to developer settings and click on don't keep activities.. Also delete battery stats in Cwm recovery ( not responsible for Wierd stuff which might happen)
4) install greenify , and hibernate apps....
6) install juice defender ( my battery life is doubled )
7) flash pure performance(look in general section) remember to backup. ( not responsible for damage)
7) take the backup of ur rom and reflash stock 4.2.1 ( not responsible for damage)
8) it might be something wrong with ur battery... So go buy another genuine CHD battery or steal it from ur friend
9) Go to service centre and show them how bad the device battery is.... If u have Warrenty ur in luck
Sent from my Micromax A116 using xda premium
Click to expand...
Click to collapse
Thank you have installed greenify and Juice defender, later will try pure performance and last option would be to buy new battery.
Cant i buy battery from different manufacturer instead of Micromax? Like ERD, MAXX.
Sent from my Micromax A116 using xda app-developers app
Yup... Do share the results.....
And as far as the battery is concerned.... Go for a genuine mmx battery.....But I won't go as far as to forbid u buying other company stuff.......
Sent from my Micromax A116 using xda premium
I have one better option. instead of buying new battery u should go for battery banks. I just bought nokia battery bank worth 1150 bucks and the benifit is it is not phone specific and will charge battery quickly as it has more mah than normal charger.
Sent from my Micromax A116 using xda app-developers app
I note that you have tried several ROMs. but have you ever tried calibrating your battery at least once after flashing any of those things?!. If not I suggest you calibrate your battery properly and then give your comments.
https://play.google.com/store/apps/details?id=com.nema.batterycalibration
Regards
EDIT: btw, don't use that pure performance mod. it causes issues. you won't need it anyway.

strange battery problem

i have installed some roms. when i install for the first time, battery time is good. but whenever charge my s3 for the second time battery drains faster.
Lastly, i installed ArchiDroid V1.7.15. Standby time was more than perfect. on avarage usage, 3,5 days
But after i charge it for the second time, battery drains faster
what is my fault?
Let the ROM settle. use what ROM you want. Charge it few times. It should pass like one week at least tohave a good view on how the battery performs.
Bloatware, apps, wallpapers, startup apps, backgrounds.. they will all consume power.
shivadow said:
Bloatware, apps, wallpapers, startup apps, backgrounds.. they will all consume power.
Click to expand...
Click to collapse
yes but i install the same apps and system each time
Are you on a cm or Touchwizz rom ?
Personally, my method for having a pretty good battery life is like this :
- After you flash your rom let the battery get empty and then charge it to the max without have it on, just plugged in.
- Repeat this method for at least 2 times and then you will get a good average of what the battery life looks like on this rom.
Keep in mind that each rom have different battery life, because of all the tweaks and optimizations that the developers add to it.
And also, don't forget that AOSP rom ( CyanogenMod, ParanoidRom, etc... ) are slightly less under the official samsung rom in terms of battery life. That's why a large number of people prefer official samsung rom instead of the AOSP one.
I think that everyone does have your problem actually
thank you
i am on ArchiDroid V1.7.15 rom
No problem
interesting, i did it 3 times
3,5 - 4 days standby time with medium usage
when i recharge from zero, it drops 85% in 4 hours, with very little usage
reformat, reinstall ArchiDroid V1.7.15 rom. and it is great again...
i do not understand anything
Maybe you can try this.
http://forum.xda-developers.com/wiki/Battery_Calibration
But I'm not sure this will work or not. Someone says this is just nothing but waste of time
RibozoM said:
Maybe you can try this.
http://forum.xda-developers.com/wiki/Battery_Calibration
But I'm not sure this will work or not. Someone says this is just nothing but waste of time
Click to expand...
Click to collapse
i have tried it 3 days ago. anyway, thanks for your help
any other help?

Battery drain... bad configuration or hardware failure?

Hi,
I'm trying to save my Samsung Galaxy S3.
I have to charge chinese golden 3000mA batteries every six hours.
After six months, batteries are completely wasted.
It's a battery eater... but I have no budget to buy an S7
Cheap phones have more or less the same features...
... and I love S3 cammera and its user replaceable battery (no more planned obsolecence, plz!)
It has installed Android 4.3, I9300XXUGNA8, kernel 3.0.31-2429075, compilation number JSS15J.I9300XXUGND5
After installing CM Launcher, and moving to Facebook Lite, the battery usage is:
screen 21%
android system 18%
android os 17%
google play services 8%
chrome 8%
gmail 3%
whatsapp 3%
waiting 3%
camera 360 3%
Also, sometimes when CPU is a little bit stressed its temperature raises.* You can feel through bottom zone of screen that it burns... could it be a hardware failure affecting battery consuption?
Any recommendation to have less battery consumption?
I'm open to change the ROM... or to install Ubuntu Touch if necessary
Thanks in advance​
Buy this Luminous(LivGuard) Battery and I suggest you to try some custom roms and choose the best rom for you LiquidSmooth KK RESURRECTION REMIX LP RESSURRECTION REMIX MM with Boeffla Kernel Use greenify,Amplify and Disable services(To disable some useless running google play services permissions).
Screenshots from my S3. Rom- Liquid Smooth. Kernel-Boeffla
Hi Sureshtuty,
Thanks a lot for your response.
I'll try both the battery, ROMs and apps
I've read these days that Marshmallow comes with Doze mode to improve battery usage
http://forum.xda-developers.com/gal...t/rom-cyanogenmod-13-nightlies-i9300-t3272811
Do you think that could I save battery with Cyanogenmod-13 (Android 6)
Best regards
Are you sure yours battery have 3000mAh ? Screen use most of energy. Try reduce to 30. You tested other kernels or try this http://forum.xda-developers.com/and...ebf-tweaking-battery-saver-optimizer-t3401341 (most tweak in bulid.prop) ?
For now cm13 is not bad but not good.
spguy said:
Hi,
I'm trying to save my Samsung Galaxy S3.
I have to charge chinese golden 3000mA batteries every six hours.
After six months, batteries are completely wasted.
It's a battery eater... but I have no budget to buy an S7
Cheap phones have more or less the same features...
... and I love S3 cammera and its user replaceable battery (no more planned obsolecence, plz!)
It has installed Android 4.3, I9300XXUGNA8, kernel 3.0.31-2429075, compilation number JSS15J.I9300XXUGND5
After installing CM Launcher, and moving to Facebook Lite, the battery usage is:
screen 21%
android system 18%
android os 17%
google play services 8%
chrome 8%
gmail 3%
whatsapp 3%
waiting 3%
camera 360 3%
Also, sometimes when CPU is a little bit stressed its temperature raises.* You can feel through bottom zone of screen that it burns... could it be a hardware failure affecting battery consuption?
Any recommendation to have less battery consumption?
I'm open to change the ROM... or to install Ubuntu Touch if necessary
Thanks in advance​
Click to expand...
Click to collapse
If youre willing to spend a few £££s you should buy a Zerolemon 7000mah battery Ive had mine for 2 years now and its still awesome
spguy said:
Hi Sureshtuty,
Thanks a lot for your response.
I'll try both the battery, ROMs and apps
I've read these days that Marshmallow comes with Doze mode to improve battery usage
http://forum.xda-developers.com/gal...t/rom-cyanogenmod-13-nightlies-i9300-t3272811
Do you think that could I save battery with Cyanogenmod-13 (Android 6)
Best regards
Click to expand...
Click to collapse
Don't go for cm13, its battery hungry. If you want good battery backup use touchwiz ROMs or if you want mm then try haxynox(eats battery but less as compared to cm ROMs)
Sent from my GT-I9300 using XDA-Developers mobile app

Best Battery life ROM?

Hello guys,
My question is which ROM seem to be best for you in battery life? Im talking about my R3Pro(ido) device. I've been using xiaomi.eu's stables from beginning which has great 8h SOT, but now experiencing like 3h SOT with LineageOS 14 always updated with Xposed and all day data/WiFi on. Any ideas? Should I change back to MIUI?
Thanks
Odoslané z Redmi 3 pomocou Tapatalku
May be you should buy a new battery?
Graddy01 said:
Hello guys,
My question is which ROM seem to be best for you in battery life? Im talking about my R3Pro(ido) device. I've been using xiaomi.eu's stables from beginning which has great 8h SOT, but now experiencing like 3h SOT with LineageOS 14 always updated with Xposed and all day data/WiFi on. Any ideas? Should I change back to MIUI?
Thanks
Odoslané z Redmi 3 pomocou Tapatalku
Click to expand...
Click to collapse
U can try:RR,SudaMod,Lineage OS 15 Unofficial or PixelExperience 8.1.
The UNTEST-20171122 version of Resurrection Remix N has the best battery life for both screen on and off time, hands down. Was a lifesaver in a recent job where I listened to hours of podcasts per day to keep sane. Keep away from Oreo ROMs for the time being, theyre still largely broken apart from PixelExperience (which instead has the fun problem of ridiculously fast battery drain.)
picopi said:
The UNTEST-20171122 version of Resurrection Remix N has the best battery life for both screen on and off time, hands down. Was a lifesaver in a recent job where I listened to hours of podcasts per day to keep sane. Keep away from Oreo ROMs for the time being, theyre still largely broken apart from PixelExperience (which instead has the fun problem of ridiculously fast battery drain.)
Click to expand...
Click to collapse
I've installed this version you're talking about on my friend's phone and he cannot go over 3 hours of SOT, he must charge the phone before going to bed.. did you install some kernel too or anything else?
aittamattia said:
I've installed this version you're talking about on my friend's phone and he cannot go over 3 hours of SOT, he must charge the phone before going to bed.. did you install some kernel too or anything else?
Click to expand...
Click to collapse
No. The only things I flash on my device are the ROM, GApps and Magisk. The battery usage when the screen is off is the prizewinner here. It rarely goes down more than 2% after being left for more than 2 hours, which is ideal for me. Still though, I'm pretty sure I get more than 3 hours of screen on time. Learn to use some basic battery saving methods; turn the brightness to 50% or lower, turn off wifi or data when you're not using it...or better yet, learn to restrain your usage of it when out and about
When I go out, the phone is generally being used consistently all day via me using Bluetooth headphones along with some occasional use of 4G data. It usually never gets past the 40% mark by time I'm back home and I'm usually out for more than 5-6 hours per day. Honestly I'm not personally sure what the issue with having to charge it daily is...I've never had a phone which didn't require such a task, with the exception of things like the original Nokia 3310.
picopi said:
No. The only things I flash on my device are the ROM, GApps and Magisk. The battery usage when the screen is off is the prizewinner here. It rarely goes down more than 2% after being left for more than 2 hours, which is ideal for me. Still though, I'm pretty sure I get more than 3 hours of screen on time. Learn to use some basic battery saving methods; turn the brightness to 50% or lower, turn off wifi or data when you're not using it...or better yet, learn to restrain your usage of it when out and about
When I go out, the phone is generally being used consistently all day via me using Bluetooth headphones along with some occasional use of 4G data. It usually never gets past the 40% mark by time I'm back home and I'm usually out for more than 5-6 hours per day. Honestly I'm not personally sure what the issue with having to charge it daily is...I've never had a phone which didn't require such a task, with the exception of things like the original Nokia 3310.
Click to expand...
Click to collapse
I did the same on my friend's phone: Rom, gapps mini and Magisk. I can't tell you about his usage of the phone, but I've seen battery stats and it just can barely reach 3 hours of SOT, the usage is mostly of socials and music.. This rom here and latest LOS builds are just very battery draining, I don't know what to do with that phone! Anyway, thank you for the reply and the tips, I'll let him know!
What about MIUI? Maybe the EU version? Somedoby that tried that out can tell which will be the pros and the cons? Is it still on Lollipop?
aittamattia said:
I did the same on my friend's phone: Rom, gapps mini and Magisk. I can't tell you about his usage of the phone, but I've seen battery stats and it just can barely reach 3 hours of SOT, the usage is mostly of socials and music.. This rom here and latest LOS builds are just very battery draining, I don't know what to do with that phone! Anyway, thank you for the reply and the tips, I'll let him know!
What about MIUI? Maybe the EU version? Somedoby that tried that out can tell which will be the pros and the cons? Is it still on Lollipop?
Click to expand...
Click to collapse
Ahh, social media apps can very easily drain the battery from what I remember. The Facebook app is especially bad for it if I recall correctly. Perhaps grab a Wakelock detector app, see if anything is keeping the phone awake and then use Greenify to stop the apps from doing that.
With regards to MIUI, I seem to recall stock MIUI (from the official Xiaomi site) definitely having the best battery life out of every other rom I've used, with MIUI.eu not being as good but better than other custom roms. In terms of pros and cons, there isn't much. It works a little differently to regular Android so there's some bothering aspects to it (such as the Files/Documents app being disabled by default for some unexplained reason, meaning you have to re-enable it after every reboot.) And yes, It's still on Lollipop sadly, meaning apps like password managers etc can't use the fingerprint scanner.
Honestly I'd say wipe everything on the phone, clean flash RR-UNTEST and then slowly re-add all the apps and see if one in particular causes heavy battery drain.

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