Develop Bugs

RTT mode for more battery life?

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!
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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
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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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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.

[Q] Good battery in Manhattan, Bad Battery in Queens

I have been getting excellent battery life with my EVO running Baked Snack 1.7 and Netarchy's kernel. Typically I'll end the day with ~70% battery left.
Last tuesday however, I went out to the US Open in Flushing, and it was drain city. When I got home, I had ~20% battery left. Keep in mind, I had full or mostly full bars the whole time, so I don't know that it was really a signal problem.
Weds-thursday, my battery was fine as I stayed here on Manhattan and was back to getting my ~30% total drain in a day.
Last night I went back out to Flushing again for a Mets game, and came home with ~18% battery left.
WTF? Is there something wrong with my EVO? I had heard a rumor about these phones having trouble connecting to Motorola towers or something like that, but not sure if it's true. Is there anything I can do to fix this?

Stay in manhattan.
Sent from my PC36100 using XDA App

is 4g enabled while in flushing and not in manhattan?

If in Manhattan, your phone is connected to WiFi access points, it will favor that connection over 3G and its time syncing data using that lower power radio. When you are not around a WiFi point (maybe when you are in Queens), your phone is forced into 3G.
One thing that will help in general, is to make sure the following is set:
Settings / Wireless / Mobile Networks / (uncheck always-on)

Thanks - much appreciated. Unfortunately, I had wifi off, and 4G off as well, so I don't think it was related. I typically keep wifi off when not at home and don't see that much of a drain.
It happened again today when I was visiting a friend in Dumbo. It seems like the phone is constantly searching for towers, even though it has a connection. I don't know.

[Q] battery sucks after 3g boost hack

I did the 3g signal boost hack that you can find in the 4g signal boost forum and in less then a couple of hours I noticed that my battery life went down quick.. before on a full charge I was getting like around 17 to 18 hours a day.. but now im only getting like 8 in a half hours on a full charge.. I am on the SuperNova1.5_DK28 rom.. and I use Juice Defender.. and I keep blutooth and GPS on all day long..
I just wanted to know if anyone else battery sucks after doing the hack, or am I trippin??

Did you do the 4g trick as well? And did you have 4g on? The 4g trick will probably hurt your battery life when in it is on in low or no signal areas. I don't know why the 3g trick would affect your battery.

DiGi760 said:
Did you do the 4g trick as well? And did you have 4g on? The 4g trick will probably hurt your battery life when in it is on in low or no signal areas. I don't know why the 3g trick would affect your battery.
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no I didnt do the 4G trick because I NEVER use it.. but im using it right now to tether and its BLAZIN fast. its damn near like using comcast. lol
so im gonna try the 4g trick right now.. and just use 4g when im tethering..
but on the 3g.. I even did the battery clear thing that I read on a diffrent forum. and it still came back with only 8 hours fully charged.. im probably gonna change to a diffrent rom in the next few days so hopefully it changes it back to the way it was..

Can you give me a link to the signal boost hacks? Im interested in trying these out
Thanks

[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.
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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 .
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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!
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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+.
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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"
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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
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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.
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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?