HTC EVO 4G :: Cell Phone Transmitter & Battery Drain
Jun 3, 2010
A cell phone is a transmitter just like a radio tower, and higher power is required to send the signal farther. Every modern cell phone automatically adjusts its transmitter power based on reception. Fewer bars means faster battery drain when you are using your phone. Switching to 2G will not necessarily save battery. If you have a 3G tower nearby, then your battery will last longer. And if you have a spotty 4G connection, you'd best plug in, or don't use it. However, given equal signal strength, a 4G signal is MORE efficient per byte than 3G.
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Sep 20, 2013
I recently purchased this Tablet cum Phone Device (Asus Fonepad) in India. I found this device very impressive with decent battery backup along with great standby time. Everything was allright. In morning I found heavy battery draining during standby.
Next day I uninstalled that Black market application and Uninstalled Exdialer with all downloaded themes. I got full signals and everything was working fine. But the Battery Drain in standby remain same. I observed the situation till next two days. I searched to forums and did following things:
1. I made factory reset to my fonepad. which was haviing 4.1.2 Android after updating through OTA. Which remains same after Reset.
2. I didnt install any other applation
3. I turned of all battery comsuming services like GPS/ Location reporting/ Data/ Wifi/ Uninstalled Google Play Service Updates etc
4. Installed Wakelock detector, Better Battery Stats etc All are showing that phone goes in deep sleep no prblem but Wakelock detector show that Cell Radio wakes up so much time when phone is on sleep mode. Default Battery monitor of Android Showing "Mobile Data" as most battery comsumer.
One thing I want to mention here the device is supportive to mini sim only. I was not having mini sim so I went to market and mobile shop keeper cutted my Sim to adjust into that slot and it woked. I was using same sim from Day first. It's Vodafone INDIA.
I have not rooted nor flashed anything from my fonepad. I am reached to the conclusion that There is some problem with Exdialer installation and applying new/old theme combination to it which made me device with no signal. And now The Cell Radio has been changed which is attempting to achive something in standby mode. Which is causing heavy battery Drain. Standby time is reduced to almost 15-16 Hrous
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Jun 15, 2012
I've ported a Hero ROM to a HTC Magic.Here's my problem:
Problem: There's a great battery drain when you're connected to the network (no data but just mobile network for calls/SMS)
Ported ROM: Sandwich Deluxe 4.0 .
Original ROM: Hero ROM
Kernel: carz-2.6.34.4 (fast and stable)
The mobile network drains battery.I'm not in a low signal-area. Everybody who uses the ROM has a drain.I'm using a 2.x.x instead of a 3.0 kernel for an ICS ROM, can it be that this mismatch creates the drain?The phone displays a singal strength of 0dBm 97 asu. (Not normal?)
What doesn't cause the problem? In airplane mode there is no drain at all. So it is unlikely that some apps causes the drain.Wifi, GPS, sync, ... are all disabled.
What do you expect from xdamembers?
- Confirmation if the kernel is the issue of the drain. If not, I would like to know which files (in ROM) are responsible for network signal.
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Nov 21, 2009
I think I figured out why sometimes my Droid stays on for 1.5 days and sometimes after 6 hour of just being idle the battery is drained.
When wifi is turned on an connected to a network, the cellular signal is way low and it just drains the battery.
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Jul 3, 2012
I'm about to retire my trusty old Epic 4G and whats the best way to store my battery on it. I will be removing it but I'm not sure whether I should store it fully charged or half way charged. If I remember correctly, I read somewhere that you should store your battery with 50% charge for it to have some life if you ever need to use the phone months or a few years time. Storing it fully charged can pose a threat due to the battery blowing up?!?! Not sure if this is correct or not. What to do to preserve your unused batteries in your old phones?
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Oct 26, 2010
How can I turn off "Cell Standby"
Battery used by cell radio?
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Oct 14, 2010
Is it me or anyone else experiencing the rapid drain of battery after the recent OTA update from T Mobile for the Vibrant. Prior to the OTA update, my Vibrant charge used to last 2-3 days of normal use before I had to charge. Now the battery life is considerably shortened and from 100%, it goes to below 20% in 12-15 hrs, most of it is idle time. My normal usage has not changed at all before and after the update but I am experiencing this rapid battery drain phenomenon on my Vibrant.
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Aug 15, 2010
About a week ago, at random times, my Incredible will become "Incredibly" hot in my pocket, and the battery begins to drain at a rapid rate (from nearly 90%+ to <20% in an hour).This seems to be accompanied by an icon resembling a "refresh" symbol at the top of the screen (a circle consisting of two arrows).I can't determine any common denominator as to when this takes place, it seems pretty random.I added Google voice and Shazam to my phone just prior to this problem beginning, but have noticed no usage relation. Please feel free to direct me to another thread / lock if this has already been discussed.
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Jan 13, 2010
My Eris, just updated on Monday for the lock up from sleep Anyway, I am a low user of the phone and keep, wifi, Mobile data off unless I am using it I have noticed the last 2 days the battery life is improved. yesterday, phone on at 6am off at 11pm, 65% left, no data used, few Txt messages and about 45 min of phone calls Today so far, on at 6am, WIFI, Mobile data off, one 6min call and one txt, at 9am, still 100% battery. turned Mobile Data on at 9am now it is 11:50am and battery is still 100% my on time is 5:45, awake time is 8 min (2%) this is typical for me. I don't have email set to push, I refresh when I want it. I also use Advanced Task Manager. So maybe the issue that was fixed was also causing a battery drain and is fixed now?
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Nov 13, 2010
Last two days my battery has been draining like crazy and my phone won't go into sleep mode. I charge before I go to sleep and take it off when it's done and it will die before I wake up in about 8 hours .
Use to be at like 97 or 95 when I get up
I've gotten pretty good at managing my battery life , I use superpower and juiceplotter to monitor it .normally I waist less than 1% an hour when not in use and the phone is asleep
I've deleted every app I've installed since 1 day before this started. Only thing unusual I see in my logs is this message (Adding Alarm{464294e8 type 2 com.android.phone })
And this
Alarm triggering: Alarm{46354990 type 2 com.google.android.location} Adding Alarm{465bbb80 type 2 com.google.android.location }non stop repeatedly every second when phone is not in use.
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Aug 6, 2010
Just yesterday my phone was getting more than 14+ hours of battery. Now it's draining really quickly even when I'm not using it (I left it on while I was asleep). It's not facebook because I already downloading the fix and rebooted. My "time without signal" is 0% so I don't think that's the problem. I did download Quickpedia yesterday but a quick search tells me that's not the problem either.
The only other thing I did differently was switch from ADW to LauncherPro yesterday, but if that was draining the battery wouldn't it be under Android System and not standby or idle? Regardless, I switched back to ADW just to see if that works
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Aug 1, 2010
So I have had my phone since before launch and I have noticed the battery drain as others have but here is my question. Do you think it is the battery or the phone?
If I can go to the store and just get a new battery that would be nice because I have rooted and customized and downloaded apps and if it is the battery that is causing the problem it would be so much more convenient to get a new battery.
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May 4, 2010
Upon starting up my phone was locked in awake status and I couldn't figure out why.
So against my will, I've downloaded ATK.
I noticed that upon killing ANY application that was loaded by the system at start up (besides ATK) would allow the phone to sleep.
So FM Radio, Footprints, Docs to Go....
Killing just one of those or I imagine just about anything else that loaded from the start, stopped my wakelock.
Also I noticed by putting the phone into airplane mode, and then taking it out, seemed to work as well.
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Feb 24, 2013
I have a Micromax A110 with the details in my signature. I flashed the ROM of a different Jellybean phone since it was the same and rebranded model.
After my phone drained out of battery, it wasn't charging even though I connected it with the charger. The phone wasn't being detected through USB also. So, I used an external battery charger and the pushed it in the device and it started up.
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Sep 24, 2010
Many of us have experienced some battery life fall out since the last update. I mentioned this in the battery life thread but I thought it deserved it own topic. I have an app that I downloaded called battery status. it has a battery history. and it says time without sleeping 7h 10m 25s ago. Thats exactally when I unplugged my phone. This explains why I am seeing 2-3% per hour loss while not using the phone and while in airplane mode. Before the update I could keep the phone in airplane mode, not usre it, and leave work with over 94% battery life. So this proves that somehow the phone is not going into sleep mode... I can guarantee that everyone else in that is experiencing battery drain since the sept 16th update is due to this reason. The question is... why the hell is this happening and why won't the phone go into sleep mode?
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Oct 14, 2010
Has anyone noticed an increase in battey drain while using the Lookout Mobile Security app? I noticed my battery drain was a little higher than usual today. I also have an app called battery indicator installed and was wondering if those apps cause higher battery drain also?
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Nov 13, 2010
Rooted Droid 1, running LFY 1.9 with it's 1ghz kernel, SPRecovery. Had a weird issue recently; the phone displayed that my battery life was at 40%, then probably ~30 minutes later it was down to 20%. I wasn't using it during that time, I just unlocked the screen to check something. Anyway, I opened my browser and within a minute or two I got the "15% battery life remaining" message, prompting me to connect my charger. I decided I would allow the phone to just die and shut itself down. So I waited ~45 minutes and it went down to 10%, then almost immediately to 5%. I turned on the GPS just to make it drain faster... I watched a one-hour television show and when it was over, I glanced over to the phone to see if it had died - nope, still on. I turned the LED light on, leaving the GPS running for ~25 minutes and it finally powered down. Then I plugged it in to charge and left the room. Came back in about 2.5 hours later and picked up the phone - it was very hot. Unlocked the screen and checked SetCPU and it was running ~135?F but it immediately started cooling down. It was fully charged, however so I unplugged it. I went to bed shortly thereafter and the battery life displayed 90% as I set the alarm to wake me up the next morning. I happened to wake up shortly before the alarm was set to go off and I picked up the phone to disable the alarm and noticed the red 'charge me' light blinking - unlocked the screen to see 5% and just then it powered itself down.
TL;DR -- Phone only got hot that one time, phone hasn't gone dead in stand-by mode again like it did that night. Battery drains at a seemingly normal rate based on my regular use from 100% down to 40%, then it rapidly drains after that, always skipping 30% and when it gets down to 5% it stays alive for quite a long time under heavy load. Is there a way to 'teach' the phone how to check and calculate actual and remaining battery % and to display it correctly? Is it kernel-related? I heard somewhere about doing a 'battery wipe' but I am unsure what that entails and searches are proving fruitless for me so far.
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Aug 12, 2010
does battery status pro drain your battery life?
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May 7, 2010
I have a Motorola Milestone with Android 2.1. I'd like an app which shows the battery level in the notification bar. Nothing fancy, no estimation of remaining battery life nor fancy eye candy. If it can show a more precise reading than the Milestone built-in one, which only decreases in 10% intervals, fine, but only if this isn't a drain on the battery. I know there are several such apps, but which do you think is the best for my needs? There are so many it's hard to try them all and choose. I just want something basic and simple which doesn't drain the battery. I tried "battery indicator" and "battery status pro"; they both do what I need, but I'm afraid they might be an additional drain on the battery.
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Sep 9, 2010
When I check what has been using my battery, I see that 32% has been used for "Battery used by cell radio". Does anyone know what that means? Does it refer to the FM radio? Because I made sure that was not turned on.
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Jul 29, 2010
I charge my evo while I'm sleeping. Last night I went to sleep with it at 100% and woke up 10 hours later to find that I had lost 50%. Battery indicator told me that it was 48% cell standby and 48% phone idle and only 2% Android system. Is this usual? I didn't know just leaving my phone on the table would kill so much.
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Jul 11, 2010
Im trying to figure out the consumption issues with my battery and cell standby. it is currently responsible for 39% which is at the top of the list just above phone idle. what really concerns me though is my time without a signal is 49%!! but everytime i look at my phone it has 3bars! how can this be? and im assuming this is whats killing my battery? it should be noted that i dont think i have the "bug" others seemed to have.
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Apr 30, 2010
I was just wondering if anyone had the same issue as I do, with about 44% of my battery use coming from the notorious call standby.
I heard some speculation that this is akin to the issue with the Eris 2.1, so it would be solved by the Airplane Mode trick, but I have not found any results favoring that remedy.
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Jul 16, 2010
On a road trip rght now from buffalo to dc will using a car charger with my evo ruin my battery life I know my old phone did
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Jun 14, 2010
I installed the Missed Reminder app on my phone this weekend but I've read around here that this is a big battery drain program. By navigating to the Battery usage section within the Android settings, the Missed Reminder app doesn't even show up. Does this mean the app is NOT draining, or am I looking in the wrong area?
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Jul 23, 2010
Well, its been about 32 hours with my EVO...and im loving it.
I admit, the battery worries me a bit. However, some commonsense things (and not so common sense, like the GSM/CDMA battery life change) have really helped. Task Manager seems to be the best overall task killer app, and keeping background data on but auto sync off seems to be a nice happy medium for syncing.
The major, MAJOR battery drainer? Google Maps/Navigation. The perfect argument for a car charger that can EVER be made. Ye gods.
So I unplugged it from my charger at 11 this morning. As of right now at 6:43 pm i have 41% battery left, have been fiddling with it for about half of that time, and turned disabled the data connection while i was in low signal areas during a short road trip.
Moderate use of Yahoo Messenger, texting, a few 5 minute phone calls, the occasional manual update of the Seesmic twitter client and a few other things have drained it a little bit...but a 5 minute stretch of Google Navigation? Did the most damage to the battery, knocked it down by 7 percent. Again...car charger. Need this soon. Anyone know of any reliable ones?
Other than that, great phone. Versatile, and I'm looking forward to the day that Android 2.2 comes to us for even more battery efficiency. Please feel free to ask me anything about how I have things set up, constantly trying new things out on this!
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Jun 19, 2010
So, i have tried most of the battery fixes on the forums, but my battery drains super fast. disabled talk, did the cdma fix, closed all possible running apps, turned off autosync and the battery still drains. It drained 35% in 30 minutes on airplane mode. I have the battery indicator app installed and the current temp is almost 45 celsius. Is this too hot? My phone is currently charging.
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Oct 20, 2010
I know that this has been covered numerous times, under numerous various situations, but I am hoping I just missed something.I've had my Evo for about 2.5 weeks now, and love everything about it, except the battery (obviously). I expected about the amount of battery drain that I'm seeing from day 1, but the thing is, with all things equal, I was getting better battery a week ago.Basically, I followed several forums and tips that help to alleviate battery drain. I turned things off, tweaked update freqencies and other settings. I conditioned the battery in the manner that was suggested by HTC as well. After doing this, I was getting about 22-24 hours of battery with normal daily usage.All of a sudden, about 7 days ago, I went from 22-24 hours to about 10-12 (if I'm lucky). I realize that adding certain apps can cause things to go awry, however, I have deleted everything I had installed since realizing the excessive battery drain and I'm still getting drain. At times it appears that the phone isn't sleeping, however, when I look in settings, it's difficult to tell what is keeping it awake.Normally , this wouldn't bother me, because I kind of expect this kind of battery life, however, knowing that I can easily acheive 20 hours and not getting it is killing me.
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Sep 23, 2010
If I have Gmail set to autosync, but have 3G (and WiFi and 4G) turned off, does this drain the battery when it tries to sync, or does it just not sync? I'd rather not have to manually turn off all syncing when I want to go off the network for a while.
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Oct 5, 2010
I noticed when I have GPS on but am not in an app that uses it, there is no GPS icon in the status bar. When I go into Google Maps, for example, then the icon appears.
Does this mean that when it's not being actively used, it isn't really "working" and thus not draining the battery, or at least not by much?
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