RTT mode for more battery life? - EVO 4G Q&A, Help & Troubleshooting

Obviously we don't need 4G or 3G running when we're just walking about town waiting for phone calls, emails, or texts. Is there any way to reduce battery drain by turning off the 3G EVDO radio and falling back to 1xRTT, in a similar way to how we currently turn off 3G UMTS/HSDPA on an iPhone and fall back to EDGE to preserve battery life?
Any help would be appreciated. Thanks!

TKardinal said:
Obviously we don't need 4G or 3G running when we're just walking about town waiting for phone calls, emails, or texts. Is there any way to reduce battery drain by turning off the 3G EVDO radio and falling back to 1xRTT, in a similar way to how we currently turn off 3G UMTS/HSDPA on an iPhone and fall back to EDGE to preserve battery life?
Any help would be appreciated. Thanks!
Click to expand...
Click to collapse
I have been thinking about this and would like to know as well.

Just because 3G GSM is not as efficient with battery life as 2G does not necessarily mean the same problem exists for cdma technology, however I do not know for certain and its a good question

drewX2 said:
Just because 3G GSM is not as efficient with battery life as 2G does not necessarily mean the same problem exists for cdma technology, however I do not know for certain and its a good question
Click to expand...
Click to collapse
Indeed. I don't know. And that's why I'm asking!

A few things might improve battery life:
-Turn off constant GPS; it chews up battery when not needed. It's on by default with the EVO and queried every 3 hours (default) by Sense UI for weather information. You can get the same information based on Cell Tower triangulation without firing up GPS needlessly.
-Sense UI (according to rumor) uses more power in and of itself than the stock Android GUI.
-Froyo (by virtue of JIT) should be more efficient and therefore consume less battery life as well.
One topic I'm not sure on is whether Android can scale CPU clocks automatically based on need, like mobile CPUs for laptops/netbooks do? If not, it should absolutely be implemented, and that would be my next project..

Coming from a samsung moment to the evo i can say that jumping back and fourth between evdo and 1xrtt cancause battery drain. Really theres no great method to combat this other than using common sense. If your not in need of gps- turn it off. Turn off queing for cell towers as well, while it doesnt consume as much power as the gps it does take some resource to triangulate your location. The only other thing i would say is using setcpu and establishing profiles that suit your needs. I.e. screen off can be the lowest cpu setting while battery at 50% you could set your profiles clock speed to sit at 600-700. But thats all providing an app like setcpu will play nice with the evo.
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It does not seem like the phone has 1x radio in it. I have never seen it ...not even once fall back to 1x even with zero bars.
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clubtech said:
It does not seem like the phone has 1x radio in it. I have never seen it ...not even once fall back to 1x even with zero bars.
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Sent via the XDA Tapatalk App
Click to expand...
Click to collapse
I assure you it does.

I manually set my wife's pixi to 1xrtt and her battery life has increased significantly, had to do some hidden code, so perhaps same for evo

It's ##EVDO# in WebOS. Not sure what the code is in Android.

Related

Does signal strength affect battery life?

My phone seems to suffer really poor battery life.
Checking on my handset under the testing menu, phone info, I find that my signal strength while I'm at my workplace is just -109dBm.
Does this poor of a signal mean my phone has to work harder to maintain a connection, therefore caning my battery more?
Sent from my HTC Desire using XDA App
yes, your thoughts are correct. A poor signal forces the phone to bump up the power to try and improve the signal.
Anything I can do, aside from use 2G instead of 3G to conserve power?
Sent from my HTC Desire using XDA App
I found that my phone using WiFi to sync used less power compared to relying on the phone network alone in areas of poor signal.
Sent from my HTC Desire using XDA App
109dbm is pretty poor so your battery life would be poor. you would lose the signal at 113dbm. quicker switch to PRL provider happens if you fiddle the test setting menu. and this has an affect on battery life too inadvertantly as the switch to PRL provider happens quicker and battery power is not lost mindlessly bonking the airwaves to get a signal. but the PRL switch will happen only after the parent signal is lost, if it keeps fluctuating between parent and PRL signal then you will still be losing more power. another way would be to edit the PRL file settings which i am not familiar with but can be done as per some posts on xda or to force it to stay on PRL provider which can also be done as per some posts on xda but untrodden territory for me but am exploring it for the moment by reading up on it. most are explanations on evdo and not hsdpa / umts so am not keen on going down the editing PRL files option unless i can see some anecdotal evidence given by braver people who have treaded down that path before.
or you could go the easy way and buy a signal repeater (fixed or potable versions available) and get better signal and battery life consequently as a bonus.
My battery life is pretty good.
setspeed said:
Anything I can do, aside from use 2G instead of 3G to conserve power?
Sent from my HTC Desire using XDA App
Click to expand...
Click to collapse
2G eats more battery than 3G, but you must have strong 3G signal, if it is weak than u get higher battery drain on 3G, and also if u use automatic GSM/WCDMA on that switch from 2G to 3G and reverse you loose a lot of battery power.
First impression is that 3G uses more power. However its transfer speed is much greater, so the overall Watts usage for the same downloaded size will be smaller, which makes 3G more efficient and thus less power consuming in practice.
Here is an example to illustrate the above statement. Let’s assume that we want to download 1000 Kbytes:
2G: 1000 Kbytes at download speed 8 Kbytes/s will take 125 seconds. At the power usage of 1.27W this will take about 159 Watts-seconds (125 seconds * 1.27 Watts).
3G: 1000 Kbytes at download speed 65 Kbytes/s will take 15 seconds. At the power usage of 1.69W this will take 26 Watts-seconds (15 seconds * 1.69 Watts).
Click to expand...
Click to collapse
for battery life issues read this link http://myhtcdesire.com/tipstweaks/t...about-li-ion-batteries-but-were-afraid-to-ask
for network signal issues and attenuation read this link http://forum.xda-developers.com/showthread.php?p=7544011#post7544011
hope the links help understand the issues a bit better even if it is not a solution!

[TIP] Greatest Battery saving tip you'll ever find

Hi all.
I tried this originally on my desire, then in my wifes wildfire S to great success.
Go in to the phone app
type in *#*#4636#*#*
Select 'Phone information'
scroll down to the bottom
in the 'set preferred network type' select 'GSM auto (PRL)'
then press back to return to your home page.
The wife doesn't use her phone much, ie a phone call or two a day, after a DAY of being unplugged from the mains the battery was still registering at 100% !
This doesn't affect the phone's functionality at all, it still allows for you to connect to a 3G network, what it does is connects to 2G when the 3G signal is weaker for calls and texts.
You may get varying results but every phone I've tried it on has boosted the battery by hours when idle.
Enjoy!
Updated with proof
Hi guys, just to show you how much better this setting is, my wife's wildfire S normally needed charger every 2 days.
As you can see it's passed 2 days and it is still registering over 80% remaining battery.
I'll update when it finally dies, which should be in about 8 days
tried this on my wildfire s and afterwards it just kept turning my network on and off.. Switched back to wcdma preferred
I haven't seen that before, you might be in a weak 2g signal area thats why it's constantly trying to resolve the radio.
I assume this will work for some ( I live in an area that is very well covered by orange) and not for others depending on your network coverage.
Does it still do it when you switch to GSM only? It will kill your internet speed, but just to test if it's the 2G mast or not, then switch back to WCDMA preferred if it works best on your phone.
If GSM only is okay, you can use widgetoid 2.x and make a short cut to the normal settings options to switch between gsm only and WCDMA which will help, but I find it a bit of a pain in the perverbial behind.
As with most tips its not a one size fits all, however I've done it on 5 phones ( all HTC) which has improved the battery.
Hi,
as for me, I have really a lot of problem regarding the battery life.
Today it was 100% and after 8 hours just 55% left.
Without using any wireless conection, and just 2 text.
Any way, maybe you can tell us, how is the wildfire S form your configured, homescreen widget?
which battery tool do you use?
I just made again a reset, and I will try to set GSM only, coz I do not use internet at all.
by the way, great thread.....)
bye
She's got it extremely basic, no widgets, no weather nothing, there's only 4 shortcuts on all her home screens, mostly black background (static picture).
No battery apps or task killers are on it.
All radios, GPS etc are disable, screen brightness on auto ( however I usally leave it around 20% for better battery performance)
It is never connected to the internet, she uses it just as a phone. I'm quite impressed with the battery life she gets.
I'm a bit curious, if she just used it at the most basic level, than why would she get a smartphone?
Sent from my HTC Wildfire S A510e using XDA App
Hi Guys,
Just a quick update, the phone has made it to over 6 days stand by and the 30% energy saving has only just kicked in.
What I wanna know is, is there a way to log (appart from logcat) what's going on it the background. Granted she doesn't use it a lot (mostly as a personal radio and because it was a free upgrade to answer the previous question) but if you look the angle of decline increases after use when surely it should sharply drop and then continue on the same curve?
Nevermind.
This means her phone is up to 151ish hrs standby and still going, I'm gonna have a few more tweaks and see if I can get it anywhere close to the times quoted on the HTC site:
Standby time:
WCDMA: Up to 570 hours
GSM: Up to 360 hours
Infact (sorry i think outloud when I'm typing) how the hell do they think you'll get BETTER battery life on WCDMA? No chance unless you live under the mast and never leave the house.
I think for my next test I'll put it on WCDMA only and see how it affects the battery.
Also the battery doesn't have a very high capacity. That could also be the problem. I heave heard the hd2 I think has the same battery size but a much higher capacity.
Hi, I got my WS last week, and so far I cannot complain about battery. I am using it on GSM only, no data, bluetooth on, I'm going trugh an average of 40 calls a day, and in the evening I still have about 60 % of battery left. I am pretty sure that that won't be the case if I use mobie data or WiFi though.
Sent from my HTC Vision using Tapatalk
Hi,
I just can agree, coz even I made a test put the WS on GSM only, and it seems reallly to having more battery life.
As for now, just to have the usual use, 5-10 text 3 calls a day a bit wlan, i can use it for now almost 5 days, which I think it is ok.
thanks
This is an incredible tip. 24hrs and I've still got a full battery!
Sticky please
hi guys.
i'm just trying this tip right now, but, please, can someone explain to me what are the differencies between cdma and gsm "stuff"? (i am using 3g, wifi and classic phone functions)
thanks a lot
baaabovka said:
hi guys.
i'm just trying this tip right now, but, please, can someone explain to me what are the differencies between cdma and gsm "stuff"? (i am using 3g, wifi and classic phone functions)
thanks a lot
Click to expand...
Click to collapse
If you connect to the internet on your phone through your network provider don't switch to gsm only as 3g signals are much much faster. If you only connect to the internet when there's a wifi signal then set it to gsm only to save the battery.
thanks mark.
i switched to "GSM auto (PRL)" as amraving said in first post. i am using 3g only for sending sms through app called free sms sender and for update weather. so internet speed is not my priority. hope it will works fine.
First time I read this I thought this is in setup, didnt know there was a secret menu. I just activated it now then I got full bars than just GSM only. thanks buddy.
baaabovka said:
thanks mark.
i switched to "GSM auto (PRL)" as amraving said in first post. i am using 3g only for sending sms through app called free sms sender and for update weather. so internet speed is not my priority. hope it will works fine.
Click to expand...
Click to collapse
No problem, I set mine to gsm only and I've noticed a fairly big difference with battery life, can last a few days on idle, not to bad with moderate wifi use either.
Its good to see so many people getting some use out of this tip. If it helped could you click the thanks?
HTC desire. amoled.
stock hboot
insert coin 1.0.8 stable.
1gb ext3
So if you use this tip you wont be able to use 3G and HSDPA ?
Giving this a go, I never use Mobile Network, only wifi so.. lets see.

[Q] 4G or WiFi drains more battery?

what wastes more energy? having 4g on or having wifi on? i read the other threads but it had to do with 3g.. they said 3g wastes more power. is this the case with 4g as well?
thanks!
WiFi drains more battery always
that's from personal observation on all the phones i've owned in the past to now
as soon as you use WiFi the battery drains like there's no tomorrow
however this phone seems to handle it quite well
Yeah, 4G is a big battery hog. Wifi doesn't drain as much so long as you are connected to the same one for a while.
EDIT: just saw AllGamer's reply. Wifi really drains that much? I remember seeing the Droid Razr review saying that 4G eats batteries for breakfast. I might be wrong then!
Sent from my SGH-T989D using xda premium
They both drain battery about the same in my opinion.
When ever I can I turn both of them off to save battery.
It's really easy with the toggles that a couple roms have.
This phone is a BEAST!
From my personal experience wifi doesn't drain as much as 4g.
Sent from my SGH-T989 using xda premium
WiFi is far more efficient than the cellular network, and any usage will count against your allocated full speed GB's.. not a good thing.
don't have a sgsII yet but my experience with my vibrant is that wifi if connected uses less battery than hspa. If I'm not connected to a wifi network it drains the battery looking for one.
Sent from my SGH-T959 using xda premium
heygrl said:
WiFi is far more efficient than the cellular network, and any usage will count against your allocated full speed GB's.. not a good thing.
Click to expand...
Click to collapse
Forgive my ignorance but how come the usage of Wifi will count against your allocated full speed? My personal experience has been different .
knut150 said:
Forgive my ignorance but how come the usage of Wifi will count against your allocated full speed? My personal experience has been different .
Click to expand...
Click to collapse
I meant not using it will count against your data allotment
lol so there's no unanimous answer. i guess i'll just try to experiment a little and see which one uses more. thanks everyone.
4G uses more battery than WiFi
Definitely 4G... I sit on wifi all day and do not use much battery at all.
skadude66 said:
Yeah, 4G is a big battery hog. Wifi doesn't drain as much so long as you are connected to the same one for a while.
EDIT: just saw AllGamer's reply. Wifi really drains that much? I remember seeing the Droid Razr review saying that 4G eats batteries for breakfast. I might be wrong then!
Click to expand...
Click to collapse
From what I understand, LTE is a bigger battery hog than HSPA+.
jasnmb said:
From what I understand, LTE is a bigger battery hog than HSPA+.
Click to expand...
Click to collapse
For sure. And after that I'd say HSPA+ > WiFi in terms of battery draining.
Wait, our phone runs off energy. Please tell me its kinetic?!
Sent from my Juggernaut SGSII or Galaxy Tab 10.1 now "In Paris"
bhowanidin said:
Wait, our phone runs off energy. Please tell me its kinetic?!
Sent from my Juggernaut SGSII or Galaxy Tab 10.1 now "In Paris"
Click to expand...
Click to collapse
Solar backpack maybe ?
ok guys lets keep this topic sane, yeah it's funny, but lets go back on topic
it's a very valid & informative question
my personal experience shows me WiFi is worst, but others here says 3G/4G is even worse, but from personal experience 3G/4G is less than WiFi
so even i find that contradiction very interesting
the thing that could make a difference is the signal strength, perhaps better 3G/4G reception requires less power to maintain the connection?
possibly the same reason why WiFi always seems to do worse for me, because all the Starbucks, Airport, Hotel, Library, and other coffe/restaurant places that offer WiFi it's horrible, very slow, and hard to maintain signal, probably because tooooooooo many people are hogging it or maybe just because too many devices are bumping each other off the Router/WiFi AP on those establishments
Whenever I use wifi I turn my data off and gst better battery that way. If you have a bad data signal or wifi it'll take more battery to try to keep a connection.
In my Bio class I have terrible data signal and my battery will drain really fast with heavy use but if I turn on my wifi and turn off the data my battery iis way better
Sent from my SGH-T989 using XDA App
So after doing testing of my own I have come to the conclusion that 4G drains more battery than wifi. With wifi I can get about 14 hrs, but with 4G I only get 6-8 hrs.
This phone is a BEAST!
AllGamer, makes sense. If you have slower networks, your screen will be on for longer as you wait inbetween pages and downloads. Fast downloads => less screen time.
My personal experience with wifi vs THREE-g is that wifi eats my battery quickly (on all previous phones and there have been many, including present BB Torch for work). An d 3G doesn't drain as quickly.
However I agree wifi seems pretty sippy and efficient on the SGH-T989. My battery is learning. I am now getting 1 day and 13 hours of discharge time. Very moderate use. 4G. So yes there well may be a difference between 3 and 4G.
I will test wifi-only as soon as I can in the next few days.
AllGamer said:
ok guys lets keep this topic sane, yeah it's funny, but lets go back on topic
it's a very valid & informative question
my personal experience shows me WiFi is worst, but others here says 3G/4G is even worse, but from personal experience 3G/4G is less than WiFi
so even i find that contradiction very interesting
the thing that could make a difference is the signal strength, perhaps better 3G/4G reception requires less power to maintain the connection?
possibly the same reason why WiFi always seems to do worse for me, because all the Starbucks, Airport, Hotel, Library, and other coffe/restaurant places that offer WiFi it's horrible, very slow, and hard to maintain signal, probably because tooooooooo many people are hogging it or maybe just because too many devices are bumping each other off the Router/WiFi AP on those establishments
Click to expand...
Click to collapse

Improving Battery Life & Signal on the Verizon GNex

Hello everyone.
So I bought this phone this past Friday and been having a blast with it. I bought the 2100mah verizon/samsung extended battery yesterday to have a bit better battery life with it. I have patience with battery life, so I'm ready to try anything.
Here's part 1 of my post (radio): So I'm on 4.0.4. I have the radio that comes with it. I noticed I can only get 1-2 bars (rarely 3) of signal at times. I read that the best way to post about this is in dBm so here are mines: -100 to -120 80% of the time. This is on 3g/4g/wifi. And it's rarely on 4g, it is always jumping to 3g. My mom has a thunderbolt and to test, I saw the thunderbolt had better dBm and always had a 4g signal, 3-4 bars constant, rarely 3g. I'm in Miami, Florida if it matters, which is a strong 4g area. When it's on 3g it gets very good signal, 3-4 bars and -80 dBm. Though sometimes I noticed my wi-fi gets 4 bars for like 10 minutes and returns back to 2 bars.
Anything I can do as far as the Radio, some people have fixed it with a new sim card but before I go get one (are they free?) let's see what I can try? Perphaps a new radio?
Part 2: Alright now as for the battery life. Here are my phone "stats": (screenshots are posted at the bottom of post for battery)
-4.0.4 Stock ROM nothing changed, just an unlocked bootloader.
-WiFi on when at home, off when using 3g/4g.
-NFC On.
-No syncing, everything updates when I open app (twitter, weather)
-Gmail is set to push, atleast I think so. It notifies me of a new email every time.
-48% Screen Brightness
-Signed OFF from Google+
That's it I believe, if anything else is needed let me know.
I have the XDA version of BetteryBatteryStats, so I guess I have the tool to fix it just need to pinpoint what the problem is. I'm draining at 2%-3% per hour with wi-fi, and no usage, just idle. Again this is with 4.0.4 update. I'm seeing people's battery life becoming awesome with some tweaking, so would like assistance on that.
Here are my screenshots:
Day 1 with ext battery on 4.0.4:
Day 2 with ext battery on 4.0.4:
Have you confirmed that you have the new radios installed?
I515.09 V.FA02 / I515.FA02 (or could show as I515.10 V.FA02 / I515.FA02)
You probably did that, but just wanted to be sure.
I have: I515.09 V.FA02 / I5I5.FA02
I appreciate the help!
How far off are you on strength from the T-Bolt? I think it's the 4.0.4 radios and I'll get into why I think that. Note that the following isn't scientific and I haven't really tested it, so don't spread this like it's fact. I live in a really strong 4G area, so in general I haven't noticed a difference with any of the various modems (I've tried them all). I will say that I worked for a week once in an area with poor Verizon coverage, and I noticed that the 4.0.2 radios worked better for me than the 4.0.3. Like, no coverage with 4.0.3 after upgrading to it, so I whipped my laptop out and pushed the 4.0.2 radios and got from zero bars w/ coverage to 1 bar. I don't know how the 4.0.2 radios compare to 4.0.4, but you might give that a whirl.
In general, I think that radio hype is just that, hype, and there's a reason why a slew of radios never make the final cut, but with Verizon trying to patch 3G/4G connectivity, I do think it's worth trying some other radio's out to see what they do in your area.
I hesitate to say the following because I have NOT paid that much attention or done significant testing on our radios, which is something I've done with previous devices. So do NOT take this as gospel, rather with a healthy dose of salt.
In my limited observation with 4.0.4, at least in my neighborhood/area of Birmingham (I have an LTE tower practically in my back yard), the 4.0.4 radios ARE weaker. With 4.0.2 radios for example, I want to say I got -70dBm on CDMA/1X in the house and usually -72dBm to -75dBm on LTE in the house. Right now, typing this thread on 4.0.4 with the phone showing 5 bars, I just checked my strength on LTE and it was registering -94dBm here at the house when I rolled onto CDMA, it showed -75dBm. When I rolled back onto LTE, it showed -75dBm (displaying 5 bars the entire time) then went to -87dBm a few minutes later. This is with the phone sitting on it's normal spot on my desk.
Random, first thoughts with 4.0.4:
1) We know that Verizon requested "updated" display bars for 4.0.4
2) There could be an issue in 4.0.4 with dBm updating/display. I haven't been at the house all day, I have roamed around, but I doubt very seriously that my real signal strength on LTE was really -94dBm here at home. When I say I have an LTE tower in my backyard, I'm literally talking about 1/4 of a mile away, on top of a hill.
3) 4.0.4 is not always registering/reading signal strength correctly, which is causing devices in a weak area to fall off of 4G and onto 3G when the issue isn't really with the tower, physical hardware, or the modem package, but on the way 4.0.4 is interpreting the signal information it's pulling in (based SOLELY on watching the signal range I just observed on LTE). That said, it easily could just be the tower this afternoon. AGAIN, take it all with a grain of salt.
I recommend trying the 4.0.2 radios, at a minimum. I would list them, but I don't know our radios off the top of my head yet (too much Vibrant info is still in my brain). Search for them, they're easy to find. BE SURE to push the CDMA/LTE radios paired together. Like, the 4.0.2 radios together, 4.0.3 radios together. Do NOT mix and match.
Generally speaking for people in good LTE areas, I think the 4.0.4 radio package is GREAT. I've noticed zero slow down. Yeah, -87dBm (which is what I normally see here at the house) IS "weak" and it SUCKS to have wrong bars displayed but I haven't noticed any slow down on the network. I think slightly scaling down LTE strength is what has helped improve battery life. CDMA radio strength does not appear to have been affected, which is what you're gonna be on in rural areas anyway so unless you're on the fringe of LTE signal like the OP, I don't think this radio package is anything to complain or be worried about.
---------- Post added at 03:17 PM ---------- Previous post was at 03:06 PM ----------
Also, in my experience as someone that travels all over for work, the only time that "weak" signal drains battery is when you're on the fringe of no connection and the OS is boosting power to the cell antenna's. On the old/real signal indicator, this was when you had a connection to Verizon with 0 bars and it was boosting you to 1 bar. I'm not comfortable stating a -dBm range because I can't remember what I observed and I didn't write it down. If you already have 1 or 2 bars (again, on the "old" signal indicator) you really don't see a boost given to the radios. By "boost", I mean you can click on the battery graph and see where signal strength went up and battery consumption did too, while your phone sat in the same place. I have a screen shot of this that I will try to find, and update this post with.
Looking at your screen shots, I don't see that affect. In general terms, your battery life looks "fine" "normal", whatever we want to call it. Bear in mind that our LTE GNex's don't get the same life as our GSM counterparts.
Edit:
Found the screen shot I was talking about. This was on stock 4.0.2 in my hotel room one night in a rural area. The night before I had data/sync on and noticed that when I woke up my battery was about dead. I knew it was due to signal strength since I was used to losing about 8% over night. So the following night I turned off data/sync and let it run over night, not wasting the opportunity to watch what would happen to battery life with and extra boost to the radio to get improved signal strength along with removing app/data activity from the battery consumption mix by keeping data/sync off. If I remember correctly, I went to bed @ 100% and woke up 7 hours 44 minutes later with something like 72% battery. Not only did the phone boost the power to the cellular antenna, but this activity also kept the phone from sleeping properly. I'm GLAD smart phone's can do this, but at a minimum, it turned a roughly 8% battery drain over X period of time into a 28% battery drain.
I hope my info/experiences haven't confused things further for you.
CDMA Input
So what have others found about CDMA battery life?? Mine is poor no matter what ROM or Kernel I seem to try to run. I also have attempted under voltages in SetCPU to see if that helps. Any feedback is greatly appreciated. Peace.
photolarry said:
So what have others found about CDMA battery life?? Mine is poor no matter what ROM or Kernel I seem to try to run. I also have attempted under voltages in SetCPU to see if that helps. Any feedback is greatly appreciated. Peace.
Click to expand...
Click to collapse
You need to define "poor". Everyone's use is different as are their apps. If you truly have poor battery life no matter what, look at the three things that are always probably the same. 1) Your physical battery. Is it defective? 2) The apps you use. Perhaps you have an app that is acting up and syncing like crazy or wasting CPU cycles. 3) The area you live in. Do you have poor signal strength?
The biggest drain on your battery is ALWAYS going to be your screen, and data/sync. In my personal use, my biggest drain is: Screen Brightness 100%, Netflix running, Audio 100% through the speaker. This equals about 30% per hour with the Verizon Extended Battery depending on what all else syncs in the background...with a live wallpaper.
Undervolting is a misleading thing. People will disagree with me, but when you look at power consumption tables, undervolting does very little. When our phones display battery % remaining, it's not based on the actual juice left in the battery. It's a calculation based on charts that the phone manufacturer (probably Google in our case) took from the hardware manufacturer and put into play that basically says that at this Processor Speed (X), this Level of Power Consumption Occurred (Y). It happened for this Amount of Time (Z) and then it compiles that data and solves for an amount of power used giving us a percentage of remaining battery life. In general, this is VERY accurate. However, there are no values programed in to account for undervolting...or OVER clocking for that matter. For example, if you're overclocked to 1350MHz, then Android is going to use the values for 1200MHz. If you put a timer on your battery life, you'll see a longer run if you run your phone until it shuts itself off. But it's not THAT big of a difference. All the while when your watching how quickly your battery bar drops with your use, you can't see a a measurable difference.
In my experience with undervolting, doing so got me maybe an extra 5% boost in battery life. I can't equate that to a time because again, usage is different. In general, a 5% swing in a charge cycle can be easily accounted for by other things. Does your processor use more juice @ 1200MHz with normal volting compared to 1200MHz undervolted? Absolutely, but undervolting isn't going to get someone hours of extra battery life, especially when our screens usually account for 60%+ of our battery consumption. All said and done, undervolting results in gaining us very few percentage points in terms of what percentage of battery life our processors consumed.
Seems like the kernel and rom do make some difference not just apps. I use AutoStarts to prevent a mess of them starting upon boot. I am sure the screen takes a ton of it. But I am convinced that it depends on voltages and kernels too. Since I notice differences.
I recommend trying the 4.0.2 radios, at a minimum. I would list them, but I don't know our radios off the top of my head yet (too much Vibrant info is still in my brain). Search for them, they're easy to find. BE SURE to push the CDMA/LTE radios paired together. Like, the 4.0.2 radios together, 4.0.3 radios together. Do NOT mix and match.
Generally speaking for people in good LTE areas, I think the 4.0.4 radio package is GREAT. I've noticed zero slow down. Yeah, -87dBm (which is what I normally see here at the house) IS "weak" and it SUCKS to have wrong bars displayed but I haven't noticed any slow down on the network. I think slightly scaling down LTE strength is what has helped improve battery life. CDMA radio strength does not appear to have been affected, which is what you're gonna be on in rural areas anyway so unless you're on the fringe of LTE signal like the OP, I don't think this radio package is anything to complain or be worried about.
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Ok KWK, but there's a trade off here. If I try the 4.0.2 radios, that some people reported bad battery life on, it's just because it had a bad trade off for SOME
people right? So that means 4.0.2 radios could be good for me and result in better battery? Can I be on 4.0.4 and have the 4.0.2 radios?
Anyone know where to find these 4.0.2 radios and how to flash?
As for the battery life part of my post, what do you guys think I should try doing in betterbatterystats? A recent thread on here: http://forum.xda-developers.com/showthread.php?t=1483829&page=3 (Go to page 3 and last post) He got his life fixed. So that's nice to know there's tweaks that can be done. Any suggestions? Look at the http://forum.xda-developers.com/showthread.php?t=1488680&page=6 thread too. "draining at 1% per hour in sleep mode & how are you doing it?"
I disagee with your comment about old 4.0.2 radios since 4.0.4 (FA02) radios have improved signal reception. It is possible that maybe it affects battery, but I kind of doubt it. Based on all the research so far, seems mostly screen eats it a lot as well as how you use all the apps on the phone as mentioned above. I mean isnt this a matter of some electrical engineering info (ie voltages etc) and how to tweak such things? I have CS degree but admit my hardware knowledge is not greatest.
Ugh, I'm in a mess now, lol. I called Verizon yesterday and followed their usual "signal solution" got me to 4 bars of 4g. Turned on WiFi - 2 bars, turned it off, back to 1-2 bar 4g that last for 30 seconds.
I'm starting to think it's the sim card.
Any suggestions for battery life? Seems my phone can't sleep. It's down to 83% after 5 hours. And all I've done is send 2-3 text messages. Do I turn off NFC for a start?
edit: Now I'm at 4 bars wifi. Goddam radios, they are so random, we'll assume the phone is trolling and continue to the solution.
bump for the night scary how fast it got to page 2.
let's get these issues fixed!
If your phone is searching for signal, then your battery life is already sucking it up. A "stronger" radio that uses a little more juice won't cause more drain than your phone will cause by throwing everything it can at the phone antenna. Just look at my screen shot from before...28% battery drained in 8 hours...an additional 20% due to the phone trying to keep a signal.
Like I said about your original screen shots, your battery life doesn't seem to be that "off to me". Just push different radios, and try them for at least a day.
Okay will do. Where can I find these other radios and how do I flash them?
Lastly, anyone here an expert on fixing phone isn't sleeping? Seems to be my major idle battery drain.
Icey34 said:
Okay will do. Where can I find these other radios and how do I flash them?
Lastly, anyone here an expert on fixing phone isn't sleeping? Seems to be my major idle battery drain.
Click to expand...
Click to collapse
You can find the radios here:
http://forum.xda-developers.com/showthread.php?t=1481095
If you have the 4.0.2 radios, you can flash that ZIP in Clockwork Recovery Mod.
It will take a few minutes so leave it be and don't do a battery pull.
Well I have the 4.0.4 radios, does that change anything?
edit: after looking at that link you provided, are those even radios only? Seems like a bootloader & radio update from 4.0.2 -> 4.0.4. And I'm already on 4.0.4. But with horrid signal.
I have had the best results with the 4.0.4 radios but you mention you are already on them.
You can try flashing some older radios but I am not sure that will help your signal issues.
As far as finding out why you are having deep sleep issues, you can use Better Battery Stats to narrow down wakelocks.
With that said, if the phone is constantly in an area with poor signal, that will cause unnecessary battery drain as well.
Where can I find these older radios?
edit: I'd like to try the 4.0.2 radio.
Update 1: So today I powered it on after having it off from 7:00 AM to 2:45 PM. It's been idle, checked email for replies on this post and this is my battery:
Something is eating up it's idle time.
I noticed on the way back to my House it picked up a strong 4G signal for 5 minutes or so. Still looking to find where the 4.0.2 radios are. Noticing a stronger WiFi signal though, and the usual 4bar 3g. All I can find is the post from adranalyne about the radios from 4.0.2 -> 4.0.4. Something I was thinking about: If I flash 4.0.2 radios, say they are bad and I need to go back to 4.0.4 would that require a whole new flash of 4.0.4 or are there seperate radios?
Here are the betterbattery screenshots: (I have for last unplugged and charged not sure where it needs to be)
I too have an LTE Galaxy Nexus and have been switching from franco's and lean kernel in an attempt to gain battery life. I have a feeling you're not going to get much better battery life with LTE turned on. I've turned off sync and LTE overnight and the best I've gotten in deep sleep is about 1-1.5% an hour. That's all after hunting down all my unnecessary wakelocks and shutting them down (GTALK_asnyc, etc) and keeping my running programs to a minimum (email, lightflow, and weather1 are the only ones ever running besides stock apps with sync on weather1 on a 6 hour cycle)
All of the two day battery life posts I've seen all seem to be GSM phones, and typically I've been getting a full day pretty comfortably...
8 hours while sleeping + 8-13 hours of light to moderate usage (1-3 hours of screen time generally)..all with about 10-25% remaining at the end of my long days
That's excellent. But one problems: (1) I can't even get a 4g signal, at most for 5 minutes in an area that I regularly get it. I have a thunderbolt next to me running 3-4 bars. I know the GNex has a bad radio, but sheesh I atleast want to have SOME 4g.
Been trying to find a radio, can't find one though, if you can link one that'd be appreciated.
Anything you see there in betterybatterystats I should shut down, and do they start backup after boot? I see the GTALK thing you were talking about on mines too, how do I get rid of it?
edit: just a few hours after my first post today:

3-5 Hours Screen On Time

I've seen screenshots of people getting 5 hours of screen-on time. Is anyone here getting that? If you are, please post screenshots below of your setup, and be VERY specific on what you are running, and how you are doing it. Please share the knowledge. Oh, and please don't bother posting if you're using an extended battery.
I'm running Liquid Smooth 1.4 and the (supposed) 3800 mAh Trexcell battery that I bought for $20 on Amazon.
With the standard battery the most screen-on time I ever got was 2:30 hrs. Now I get 3:30-4:00 hrs of on-screen time. Not quite double, but an improvement.
Frankly I don't know how anyone is managing 4 hours of screen-on time with the stock battery.
As an addendum: Even when I was running stock, I was getting equal-to or worse values for screen-on time.
95% of the people getting 4-5 hours of screen on time are on the GSM version. 2-3 hours is typical for Sprint and Verizon users.
Setups don't make a huge difference. What makes the difference is usage while the screen is on.
Depending on the usage, i can get 4 hours screen time on stock 1750mAh battery.
Just occasionally surfing the web using WiFi, no 3G connection, occasionally pressing the power button to check the time and 30% brightness.
I use AOKP + Franco (both latest), and always get around 3h - 3.5h. Half the time I'm using wifi, and I never use data. I don't have cell service 25% of the time, and usually have weak cell service.
Most of them are on wifi... like me I can get 5hrs of display time over wifi but only about 3hrs on my terrible 3G speeds and connection.
With the stock battery.
Sent From My Sprint Galaxy Nexus via XDA Premium
When I was running AOKP build 36 with Franco Kernel 166 I was able to get 3:55 with the stock battery. I did underclock to 1036MHz with some slight undervolting. I never use WiFi and my data is only on when my screen is on. I also played games for about an hour and a half.
Now I'm on AOKP build 38 with Franco's Milestone 4, and I usually average 2-3 hours of screen on time.
Unless the spring and verizon versions are so wildly different, I'm going to ask for screenshot proof if this. I bet you're mistaking "awake" time for screen-on time.
absoluteparanoia said:
Unless the spring and verizon versions are so wildly different, I'm going to ask for screenshot proof if this. I bet you're mistaking "awake" time for screen-on time.
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They are wildly different. They use different cellular technology.
But you just said at the top of the thread that Spring and Verizon have comparable times, now they are wildly different? They are both CDMA. In the case above its WiFi only.
absoluteparanoia said:
Unless the spring and verizon versions are so wildly different, I'm going to ask for screenshot proof if this. I bet you're mistaking "awake" time for screen-on time.
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No problem...
Sent From My Sprint Galaxy Nexus via XDA Premium
absoluteparanoia said:
But you just said at the top of the thread that Spring and Verizon have comparable times, now they are wildly different? They are both CDMA. In the case above its WiFi only.
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I thought you were talking about Sprint/Verizon and the GSM model, that is my fault.
BUT, Verizon has LTE for the majority of people, which will suck the battery dry faster than EVDO Rev A on Sprint.
joshnichols189 said:
I thought you were talking about Sprint/Verizon and the GSM model, that is my fault.
BUT, Verizon has LTE for the majority of people, which will suck the battery dry faster than EVDO Rev A on Sprint.
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I concur... usually if you have good LTE speeds and connection.. your battery life will be better same goes for 3G... i've seen people with full bars on 3G pull almost 4hours with the stock battery, yet with a 1-2 bar connection and a .50mbps speed... i can almost get 3 hours. I would assume that LTE would be less of a battery drain unless you have terrible connection to it.
ÜBER™ said:
I concur... usually if you have good LTE speeds and connection.. your battery life will be better same goes for 3G... i've seen people with full bars on 3G pull almost 4hours with the stock battery, yet with a 1-2 bar connection and a .50mbps speed... i can almost get 3 hours. I would assume that LTE would be less of a battery drain unless you have terrible connection to it.
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LTE is more of a battery drain than EVDO I believe. Unless you have full signal. All the time.
joshnichols189 said:
LTE is more of a battery drain than EVDO I believe. Unless you have full signal. All the time.
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hmm doesnt make sense, i figure the faster speeds would help... then it wouldnt have to struggle to pull something up through, lets say the web browser. I mean if you have 1bar of LTE then yeah thats gunna drain faster or similar to 3G. But 3-4 would be optimal.... i assume im terribly wrong but.. these are just my thoughts and assumptions
ÜBER™ said:
hmm doesnt make sense, i figure the faster speeds would help... then it wouldnt have to struggle to pull something up through, lets say the web browser. I mean if you have 1bar of LTE then yeah thats gunna drain faster or similar to 3G. But 3-4 would be optimal.... i assume im terribly wrong but.. these are just my thoughts and assumptions
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In terms of data transfer, sure but I believe just getting and holding onto an LTE signal, especially for a CDMA-based phone causes a lot of the problems.
HOW!!!!! What are you running, what apps you have, etc.
Like I said over all wifi. Skanwich and Samurai Kernel. I don't have anything that syncs. I dont use any "battery" apps and this is just Xda and various other games and YouTube... it just doesn't show up... for some reason. Also its undervolted but stock frequencies. Using the on demand governor.
Sent From My Sprint Galaxy Nexus via XDA Premium
joshnichols189 said:
LTE is more of a battery drain than EVDO I believe. Unless you have full signal. All the time.
Click to expand...
Click to collapse
I can vouch for this. When I am at home I drain battery as slow as EvDo when on LTE. But I have a better signal than most people out there.
Whatcha running?

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