Battery use study - would you take part? - Nexus One General

Hiya,
Being a bit concerned about my N1's battery use, I've started a spreadsheet in order to log how much battery it uses at night, which is the time when it should be affected the least by user interaction.
Would you be interested in taking part? That way we could get more relevant information, and maybe find out which battery use should be considered normal.
You can see the spreadsheet here, and also here. There is probably a lot of meaningful information missing, but hopefully that can be improved with your advice. Also, if you want to help edit it and log your data, just ask me for an invitation.
Thanks!

perhaps you should speak to persiansown, he is about to start a study regarding undervolting and battery usage maybe you can use his results. If you have any ideas on how to improve the study, i'm sure he will be open to them.

liam.lah said:
perhaps you should speak to persiansown, he is about to start a study regarding undervolting and battery usage maybe you can use his results. If you have any ideas on how to improve the study, i'm sure he will be open to them.
Click to expand...
Click to collapse
Can you give me a link to the thread? Thanks!

ill help with the study

Related

[GUIDES] Optmizing Evo Battery Life

The information contained in this thread is not my own work. It is simply a collaboration of the links, guides, and information I have found on the web as I try and optimize my own Evo battery to maximum performance. This guide assumes that you already have a rooted Evo, if not I would suggest heading over to the developer's section for a guide on that.
Please note I have NOT been able to test out the outcomes of all these guides so the amount of battery you save will be very YMMV. For the most part though, I don't see any of these guides harming your battery life so they are worth trying. My Evo battery is able to last 10+ hours on moderate/high use, and over 20 hours on idle through the help of some of these guides.
Let me know if you want anything added up here!
------------
Basic Evo Settings Optimization
Basic set-up information for your Evo settings.
http://www.talkandroid.com/android-forums/htc-evo-4g/5120-improving-battery-life-htc-evo.html
And another good one (longer read, but more detailed information on how much the settings affect battery life).
http://www.goodandevo.net/2010/05/20-tips-to-improve-htc-evo-4g-battery-life.html
Evo Mobile Network Modifications
Evo battery life trick read (going from GSM -> CDMA auto prl).
http://forum.xda-developers.com/showthread.php?t=700601
Hack the HTC EVO - 3G w/o Sprint EVDO coverage!
http://forum.xda-developers.com/showthread.php?t=696073
Overclocking/Underclocking
You are responsible for your own actions in this section. Overclock at your own risk!
Root + OverclockWidget = 20 to 40+ Hours of Battery Life (under clocking guide. very mixed reports its usefulness, I suggest reading the thread for more details).
http://www.sprintusers.com/forum/showthread.php?t=207985
njfoses said:
So over at android central here is what is posted. This was a conversation with a member and the developer. Where it says bills info he is the developer of this app and his statement. So it appears it does help.
Obviously it can't overclock, we all know that because of perflock BUT here's the deal, the EVO CPU is set to scale back when its sleeping by default although it doesn't always do this because it may misinterpret information.
(bills info)
What this widget does is force it to underclock so you may see a slight increase in battery.
Click to expand...
Click to collapse
Roms
Keep in mind MOST roms will help improve your battery life, but the following roms are aimed towards battery life optmization.
DamageControl v3.0
http://forum.xda-developers.com/showthread.php?t=700649
Bugless Beast v.3
http://forum.xda-developers.com/showthread.php?t=700175
Fresh
http://forum.xda-developers.com/showthread.php?t=700448&page=29
VERY useful Misc. info
Google TALK might be killing your battery life! (it's on 24/7 if you sign into a google account)
http://www.sprintusers.com/forum/showthread.php?t=207991
Good info!
thanks, i'll try the overclock (actually underclock) as my phone sits idle alot throughout the day just synching emails with the screen off so this should help tremedously.
IceCreaMan said:
thanks, i'll try the overclock (actually underclock) as my phone sits idle alot throughout the day just synching emails with the screen off so this should help tremedously.
Click to expand...
Click to collapse
There have been mixed reviews on how well that modification is working. I would say keep a close eye on your battery levels when you attempt this. I tried, and my battery dropped 23% in 15 minutes right after I took it off a fresh charge. I'm not sure if it was the overclocking widget causing this or something else but there has been a lot of varying results. I'll have to test it out again later.
Goodluck to you!
It should be noted that the "overclocking" is actually underclocking, which the EVO does automatically. There is no need for an additional widget to control this.
Sticky IMO
Changed the section to be overclocking/underclocking.
Also added Flip's rom to the list, as I've been keeping up with that thread and it seems like a lot of users are reporting substantial performance gains.
Let me know if there's anything else that needs to be added!

Battery life

The Battery in my mini behaves like it is worn out. That is, it drains very quickly and charges very quickly. Just to be sure that I have a working phone if something unexpected happens, when not in use the phone is on the cradle charging. I have a second battery on order and am hoping that the new battery will perform better than the first.
I have NoData installed and all access to 3G is blocked unless I start wifi or bluetooth. Otherwise there is nothing exceptional about the way I have the phone configured. I do check the weather twice a day and run the stocks option, and I do use it to listen to music with bluetooth stero head set maybe an hour a day.
I hate to think that this is all I can expect. If so, I will always have a battery freshly charged battery in the cradle and change batteries daily.
Howz everybody else doing? Are you getting the same sort of performance from the battery that I am?
i have same problem. i think it's a problem in current roms..
last week i saw a rom with this title "a new unlock rom by fixed battry life problem" but i don use that cuz i jus use original roms
My battery is good enough. One to two days of use.
I use the phone a lot for calls, mobile excel, off line information search (such as dictionary, tranlators, encyclopedia), calendar scheduling, gps navigation (thru navicomputer), and taking notes everyday. A few to moderate number of text per day. Plus occassional online social stuffs, music, photo browsing, and ebook reading. (When i lock down to some nice ebook topics, i can read for about an hour or two.)
With all these, the battery can typically last for more than a day. Although i haven't really tested if it can last a full 48 hours. Very rarely, i can run down to a dangerously low 20% or 10%. But never experienced an empty battery shut down yet.
For all this, i'd say it's good enough. Not spectacular. But not disappointing.
I'm particularly impressed with the battery performance under hours of gps use.
I don't really know if the gps or the battery is the great performer. But i'm quite satisfied with the performance in this department.
In fact, the acquiring of gps signal is so good, coupled with its great stamina, i decommissioned my dedicated gps device and removed it from the car, and then use HD mini as my primary navigation device.
4/2/2011 and i want to talk about battery life too...
I got my HTC hd mini with the latest maryone WWE rom, but
1st, never charges up to 100% but only 90%
2nd, I have no CHT installed
3rd, with some messages send and recieve, battery falls to 40% in 3-4 hours...
What the hell is happening?...
Looks like it's defective.
bart3385 said:
Looks like it's defective.
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Click to collapse
lol
i answered to his problem already in other thread,he is using automatically backlight,and on 70%,i'm not surprised battery is dying in few hours of using...
you are still answering to people that they have defective devices i see
tzacapaca said:
lol
i answered to his problem already in other thread,he is using automatically backlight,and on 70%,i'm not surprised battery is dying in few hours of using...
you are still answering to people that they have defective devices i see
Click to expand...
Click to collapse
I'm using automatic backlight. My unit does not behave that way.
Whatever settings you have, you should be able to charge to 100%. Not being able to charge to 100% is a sure sign that there's something wrong with the battery.
I'm trying to help this guy find answers, using his description, and supplying the most probable explanation.
I see nothing wrong with that.
I don't answer "defective device" to each and every question in this forum. Try to check. I got a couple of hundred posts. I'm sure "defective device" doesn't show up in all of them. Not even half. Not even one fourth.
I try to help with opinions from my experiences.
You try to help with yours.
Each of us contribute.
No need for antagonistic sarcasms.
bart3385 said:
I'm using automatic backlight. My unit does not behave that way.
Whatever settings you have, you should be able to charge to 100%. Not being able to charge to 100% is a sure sign that there's something wrong with the battery.
....................
You try to help with yours.
Each of us contribute.
No need for antagonistic sarcasms.
Click to expand...
Click to collapse
lol guys i thank both of you for your help. I turned off the auto backlight adjustment and i will see how it seems...
So thank you both.
About the 90%, i think is about the ROM or the Taskbar. In previous roms i had not that problem...
bart3385 said:
I'm using automatic backlight. My unit does not behave that way.
Whatever settings you have, you should be able to charge to 100%. Not being able to charge to 100% is a sure sign that there's something wrong with the battery.
I'm trying to help this guy find answers, using his description, and supplying the most probable explanation.
I see nothing wrong with that.
I don't answer "defective device" to each and every question in this forum. Try to check. I got a couple of hundred posts. I'm sure "defective device" doesn't show up in all of them. Not even half. Not even one fourth.
I try to help with opinions from my experiences.
You try to help with yours.
Each of us contribute.
No need for antagonistic sarcasms.
Click to expand...
Click to collapse
1.it can be software problem(custom ROM which he is using)
2.telling is defective is not help(in my opinion)
3.after a quick search i found at least 30 of your posts with "defective" word
http://www.google.com/custom?q=bart...=2855279901&boostcse=0&oe=ISO-8859-1&filter=0
4.it wasn't sarcasm,just a funny(coincidence maybe) that when i see your posts i see you are telling to guys they have defective Mini's .
p.s. chill out man dont take it so serious,people make jokes sometimes,if you dont accept that just tell me...
so my guess was right...ROM fault!
tzacapaca said:
1.it can be software problem(custom ROM which he is using)
......................
4.it wasn't sarcasm,just a funny(coincidence maybe) that when i see your posts i see you are telling to guys they have defective Mini's .
p.s. chill out man dont take it so serious,people make jokes sometimes,if you dont accept that just tell me...
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Click to collapse
I think it is software problem cause the max 90% charge is happening since i upgraded my rom again at first days of January...
PS. Yeah people take things very seriusly some times...
Life is wonderful guys
redeye998 said:
I think it is software problem cause the max 90% charge is happening since i upgraded my rom again at first days of January...
PS. Yeah people take things very seriusly some times...
Life is wonderful guys
Click to expand...
Click to collapse
Life is a B*** ,so F*** it )))
tzacapaca said:
Life is a B*** ,so F*** it )))
Click to expand...
Click to collapse
Haha, indd!
So thanx for the help anywayz guys!
My post, "Looks like it's defective", is a suggestion. It looks that way. It's for the owner to verify it himself. We make suggestions of possible answers. When did i insist it is indeed defective? Or even confirm that it is?
Suggesting it could be defective can help. Some had their units check, and confirmed they're defective. Some cannot confirm. For those who do, at least they got the replacement early. It's not 100% kill rate.
In my area, from the people i know, the defective rate is more than 50%. It's a good thing HTC is quick to replace most of them without much hassle. My supposed "30" post with the word defective doesn't even come close to 50% of my posts. And i'm sure not all of them is a straight shooting down of every unit i commented on. So what's the point? Trying to humiliate fellow posters? Do you get satisfaction doing such things?
Funny can be funny. You seem to have the habit of looking for the threads i posted in and shoot down every mention of defective. And then try to defeat my comment in the most sarcastic way. You keep following me around. I'm not famous. So don't waste your time doing so. It won't make you rich.
You hit someone in the head, and then said "chill out", with a wink. Doesn't make sense. You want to provoke people. And then appear very calm and peaceful.
You wanna make jokes? Sure. I actually find the first few ones amusing. Then the more you keep on doing this, it's obviously turning out to be sarcasm.
Are you provoking me to hit back at your other comments? Well, i'm not interested.
I've picked up a few useful pieces of suggestions in this forum. That's is the reason I'm trying to contribute back to try to help others. Especially the newbies. Like how i started.
That's my only point. I'm not here to amuse you, or to satisfy your ego trip.
If i've gone too far with my effort to help, someone please tell me. So that i will stop trying to contribute.
tzacapaca said:
1.it can be software problem(custom ROM which he is using)
2.telling is defective is not help(in my opinion)
3.after a quick search i found at least 30 of your posts with "defective" word
http://www.google.com/custom?q=bart...=2855279901&boostcse=0&oe=ISO-8859-1&filter=0
4.it wasn't sarcasm,just a funny(coincidence maybe) that when i see your posts i see you are telling to guys they have defective Mini's .
p.s. chill out man dont take it so serious,people make jokes sometimes,if you dont accept that just tell me...
Click to expand...
Click to collapse
Totally UNACCEPTABLE.
Please make real jokes. Picking on others is not amusing.
2 words: Stop whining.
I don't understand how a custom ROM can create such a errors. If you use the packages of the stock ROM, nothing in the software changes, so normally behaviour stays the same. Have you tried running a stock ROM?
redeye998
Have you performed a hard reset after flashing your mini with Madmatt's rom?
tzacapaca said:
2 words: Stop whining.
Click to expand...
Click to collapse
Good. Same to you. So we're quits. Don't bother me, and i won't bother you.
Let's get back to business.
What's in this ROM? Any special apps or features?

[INFO] Post preferred Set Up for the best Performance and Battery Life on your Rom!

Due to the overwhelming amount of posts in many Rom threads, it is quite difficult even with the search option to find what you are looking for. As many of us who visit XDA on a daily basis realize, a large number of these posts are very repetitive. "Which kernel should I use for the best battery life?" "What Kernel will be the smoothest on my phone?" "Oh you have (Insert Kernel Here) Kernel, what kinda of battery life are you getting?" The questions in regards to battery life, kernels, and performance go on and on. I came up with an idea for a thread and after talking to a MOD about it decided to go ahead and get it started.
The Purpose of this Thread:
-Compile fellow EVO user's experiences with certain Rom and Kernel setup's in order to help all of us get the best performance and battery life with our EVO.
-To help cut down on the amount of repetitive posting about Kernels, Battery Life, and SetCpu in Rom threads. This is a forum and it is about makings posts, but many times people end up posting questions related to these things that have already been answered but may be hard to find.
-To give members a central thread for optimal performance based on other users experiences.
-To help other members find what Kernels, SetCPU settings, and other options will work best based upon their Hardware version.**I bring the hardware version up because it seems like certain things I.E. Kernels and certain settings do not play well with certain Hardware versions of the Evo.**
-To provide an Informational thread based on your experiences to help out everyone.
Please Note:
-This thread is NOT a place to go to war with others over which Rom is best or to bad mouth other Roms, everyone has their own preferences remember that.
-In order to keep this thread as clean and productive as possible, PLEASE REFRAIN FROM ASKING QUESTIONS HERE!
-If you have a question for an individual, PM them.
-If you have a question in regards to a Kernel, refer to the kernels thread.
-If you have a question in regards to SetCPU use the Q&A or your roms thread.
-If there is a basic question that often comes up on the Evo forums I will try to
provide links to the information.
-This thread is to be NON BIASED.
**My hopes would be that enough members post their personal stats and info here that on an OP I can list each rom, the hardware versions of the phone and what set ups seem to work the best with them. This info would be based on a general consensus based upon the information posted here.**
What to Post:
-Rom and Rom version that you are using. (I.E. Myn's Warm TwoPointTwo RLS 4) PLEASE make the font for this RED so users can easily spot which rom you are on when looking through this thread.
-Current Software version on your phone. (I.E. 3.30.651.3)
-Hardware version of your phone. (0001,0002,0003 or 0004) Please make this RED also.
-This is found under: Settings>About Phone>Hardware Information.
-The Kernel that you are using, the full name. (I.E. netarchy-toastmod-4.2.1-cfs-bfq-havs-more-smartass-universal)
-SetCPU? If so, what kind of settings are you using?
-Any kind of battery tweak? (I.E. Colin pH method)
-How would you rate your usage, and what is you awake time? (I.E. Minimal, Moderate, Heavy)(Awake Time:Settings>Battery)
-On a day to day basis what do you use your phone for?
-What kind of battery life are you getting? (On full charge: I.E. 16 hours)
-The Pros/Cons of this setup. (Cons if there are any)
-Why you would recommend this set up to others? (Again, please do not use this to slander other roms)
If you choose to contribute to this thread, Thank you for reading through this and for your contribution. I think if we can make something of this thread we can all benefit a lot from it. If you have any suggestions on what I should add to this please feel free to post it with your info or PM me if your not posting. I will try to update as much as possible, and of course that will depend on the reply that I get.
Reserved for future use
I would state the awake time instead of asking if they are a moderate/heavy...seems less opinionated even though someone with 5 hours awake time with idle cpu is not the same as 3 hours under heavy load.
surrealmethod said:
I would state the awake time instead of asking if they are a moderate/heavy...seems less opinionated even though someone with 5 hours awake time with idle cpu is not the same as 3 hours under heavy load.
Click to expand...
Click to collapse
Thank you sir, I went ahead and just added it in with it. Then we get the idea from both ways. If you have anything else just let me know. I would appreciate it!
i think you should post what kind of battery you are using
is it the standard 1500 mAH battery or the other extended battery
so people won't get lost
This is a good place to start, but it's difficult to get a good idea because there are too many variables that affect battery life from user to user. In addition, my light usage could be your moderate. Then people run different programs which will affect identical setups. Just throwing these things out there if you wonder why you aren't getting the same battery life as someone with same setup.
I'll go first....
I actually think this is an awesome idea. I think the idea of "not every phone is created equally" is a little over-exaggerated with the evo. Maybe we can start finding some similarities.
Myn's Warm TwoPointTwo RLS 4
3.30.651.3
0003
HTC Kernel #17. (I also tried the King's #11 (i think) and got horrible battery drain!)
Not using SetCPU
No Battery tweaks
Moderate usage. Not sure on awake time. I will edit this later today to add.
Mostly phone calls. A couple of texts and emails. Some games while I'm on the throne. The occasional web search.
I get maybe 12-14 hours of battery life.
PRO's:
-it's pretty looking
-a themed rosie launcher.
CON's:
-I got better battery life with Fresh 3.4.0.1 and stock kernel.
-Doesn't offer the original HTC #11 kernel like Fresh does. Anyone have a link to it?
I would recommend this setup to anyone that wants a good looking rom that has lots of customization options. I use it mostly because of the look of it. But, it is quick, scores well on quadrant, and gets decent battery life... It is not the best I have found... but it will get you through most of a day on moderate usage.
---
Can someone tell me... does the battery life depend on how the kernel plays with the ROM? I could get about 20-24 hours of battery life on Fresh with kernel #11. Now that I'm on Myn's and I could find the #11 kernel again, would I get the same battery life?
Good point. One of my biggest goals is to help people who wish to flash a custom kernel find the right one that is friendly with the Rom and most importantly the hardware version. Imo a rather a kernel is going to work with a phone or not has to do a lot with the hardware.
Sent from my PC36100 using XDA App

Resetting battery stats doesn't improve performance!

http://www.androidcentral.com/wiping-battery-stats-doesnt-improve-battery-life-says-google-engineer
So says a google engineer.. engage discussion!
If these files are useless, how is the system able to rightly determine the battery percentage without a calibration process ?
rom-g said:
If these files are useless, how is the system able to rightly determine the battery percentage without a calibration process ?
Click to expand...
Click to collapse
Haha i hope that's a rhetorical question. I know absolutely jack sheet about what the battery stats do and the callibration, just thought i'd post something i stumbled across.
Feel free to read through all the comments in the article and have a good laugh at all the differing opinions.

Battery life in different roms

Please post your battery life in stock marshmallow,stock nougut,RR,AICP and other roms.
So we can compare them.
yk1999 said:
Please post your battery life in stock marshmallow,stock nougut,RR,AICP and other roms.
So we can compare them.
Click to expand...
Click to collapse
There is really nothing one size fits all kind of thing. Try these different ROMs for yourself to see what works best for you. It's hard to see which has better battery life since different users will have different usage stats.
I have to agree... One person might get great battery on RR and terrible on AICP, the next person the opposite. The only to really tell which one gets the best battery in your situation is to try them.
Data is too scattered to determine which ROM provides the best battery life. You see people getting all day battery life with different kernels, tweaks, usage, etc
yk1999 said:
Please post your battery life in stock marshmallow,stock nougut,RR,AICP and other roms.
So we can compare them.
Click to expand...
Click to collapse
I'm not trying to bash your post but TBH, any comparison you make from others is practically useless. As mentioned, people have different experiences on custom ROMs. One specific ROM might have excellent battery life on one phone and have horrible battery life on another of the same model. But there is an even more important factor that makes comparing across ROMs just as useless... Everyone uses their phone differently. Not just with apps they install, but with the features of a ROM they they decide to enable or not.
On that note, if you are considering a custom ROM, the best way to determine if it is right for you is simply to try them. Make backups that way you can revert back to the one you decide is best.
I know that every user use their phone differently. I don't know what made you guys think i don't know that. But what i am trying to compare is not overall battery life but battery life based on individual usage. Like when some one use that rom for only calls and get a lot of stand by time how much battery it drains. from that i can know how much battery it drains when kept idle. Same goes for using wifi or using mobile data , watching YouTube or reading PDF. I want to know how much battery that rom uses on what usage.
Sorry for my bad English. I hope you guys can understand what i am trying to say.
yk1999 said:
I know that every user use their phone differently. I don't know what made you guys think i don't know that. But what i am trying to compare is not overall battery life but battery life based on individual usage. Like when some one use that rom for only calls and get a lot of stand by time how much battery it drains. from that i can know how much battery it drains when kept idle. Same goes for using wifi or using mobile data , watching YouTube or reading PDF. I want to know how much battery that rom uses on what usage.
Sorry for my bad English. I hope you guys can understand what i am trying to say.
Click to expand...
Click to collapse
I understand this. But I think it would be easier to try for yourself, because to get say, me to try say 4 different ROMs, same usage, and then report back to you would be more time consuming than you trying for yourself.
I know you know that every user is different but the same user trying different ROMs for you just doesn't make sense.
yk1999 said:
I know that every user use their phone differently. I don't know what made you guys think i don't know that. But what i am trying to compare is not overall battery life but battery life based on individual usage. Like when some one use that rom for only calls and get a lot of stand by time how much battery it drains. from that i can know how much battery it drains when kept idle. Same goes for using wifi or using mobile data , watching YouTube or reading PDF. I want to know how much battery that rom uses on what usage.
Sorry for my bad English. I hope you guys can understand what i am trying to say.
Click to expand...
Click to collapse
Referencing individual usage as you have, along with any specific ROM across devices, you are not going to get consistent results. I understand you are trying to consolidate this data on one post, but there are to many variables involved.
To highlight: I could run AICP on my XT1575 with a clean install and no extra apps installed and make only calls and I might get excellent battery life on standby. But another XT1575 owner can do the exact same setup, make the same number and times of calls and get horrible battery life. This pretty much goes for any custom ROM, especially those not based on stock. This does not even account for differences in MM vs N. This also does not account for an update to a ROM screwing up battery life and the next one may fix it (which is relatively common). I've even seen where someone gets great battery life up to a certain update and thereafter it sucks, but another can experience the opposite.
And once again, individual usage still matters as individuals will have different apps installed, which can take up varying amounts of battery depending on background processes and syncing. This affects standby time and SOT to some degree. Also do not forget that the chipset on this phone is prone to negative affects on battery depending on cell signal strength, so that is another kink in observing and comparing battery life across users.
Ultimately, the best way to determine what gives you the best battery life is too rest ROMs for yourself and your specific usages.
Spencervb256 said:
I understand this. But I think it would be easier to try for yourself, because to get say, me to try say 4 different ROMs, same usage, and then report back to you would be more time consuming than you trying for yourself.
I know you know that every user is different but the same user trying different ROMs for you just doesn't make sense.
Click to expand...
Click to collapse
I am not saying anyone to try different roms for me. I was just wanting them to post battery stat of the rom they use as their daily driver.
yk1999 said:
I am not saying anyone to try different roms for me. I was just wanting them to post battery stat of the rom they use as their daily driver.
Click to expand...
Click to collapse
Yes ok. So we should be on the same page about different users using their devices differently. So if user A posts about say ROM B, and user B posts about ROM A, you know you can't compare. I would post my stats with RR but you couldn't compare to someone posting AICP stats as we are different users. The only way to be even somewhat accurate would be to get the same user to try different ROMs. Which you can do. Honestly just try the different ROMs! I will say with my experience though DU has not had the greatest battery life.
yk1999 said:
I am not saying anyone to try different roms for me. I was just wanting them to post battery stat of the rom they use as their daily driver.
Click to expand...
Click to collapse
Spencervb256 said:
Yes ok. So we should be on the same page about different users using their devices differently. So if user A posts about say ROM B, and user B posts about ROM A, you know you can't compare. I would post my stats with RR but you couldn't compare to someone posting AICP stats as we are different users. The only way to be even somewhat accurate would be to get the same user to try different ROMs. Which you can do. Honestly just try the different ROMs! I will say with my experience though DU has not had the greatest battery life.
Click to expand...
Click to collapse
Well said!
@yk1999 As stated above as well as in my post, you just can't compare experiences of users across multiple devices and ROMs as there are to many variables involved. We understand what you are asking and we are telling you that there is only one way for you to get the information you are looking for. The only way for you to figure out what will have the best battery life in YOUR situation (how a ROM operates on YOUR specific device, YOUR selection of apps, and YOUR specific usage scenarios) is to test the ROMs for yourself.
Maybe there should be an app saving battery stats for the current ROM (internal storage or personal cloud), and comparing these personal stats with previous stats made when you had another ROM installed.
Of course there are other variables that affect the battery stats (like the apps installed, or the apps you actually open in a battery cycle) but at least the app would be able to list and compare battery stats on the same device and user.
Ie, I imagine a list like:
- ROM R1. Kernel K1. X1 apps installed. Battery rate: BR1
- ROM R1. Kernel K2. X1 apps installed. Battery rate: BR2
- ROM R2. Kernel K1. X1 apps installed. Battery rate: BR3
...
It could be able to group by Android version,...
I haven't found an app doing this. Do you know an app doing it? And, do you think this app would make any sense?

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