Develop Bugs

[Q] Why does the cell radio drain so much battery?

Hi.
So now my father's phone appears to drop about 70% in 24 hours. The sad thing is it happens with no usage at all!! In fact the Wi-fi, mobile data, GPS, bluetooth were already disabled, brightness set to nearly-minimum and SetCPU to ~300MHz.
I checked the battery usage and this is what I found:
41% Cell standby (time without coverage 0%)
37% Phone idle
...
What should I do? I fail to believe that battery is suddenly so poor because not too long ago it, according to my father, it could stay for like 3 days.
ROM is quite old CM7.

Low coverage area? Phone will constantly search for stronger signal. Last week I was on top of 21 story building with poor signal all day, bursted through my battery easily in 4 hrs.

prananas said:
I fail to believe that battery is suddenly so poor because not too long ago it, according to my father, it could stay for like 3 days.
ROM is quite old CM7.
Click to expand...
Click to collapse
I believe that batteries can sometimes go from good to bad almost instantly than gradually. So I'm really not surprised that the battery runtime went poor all of a sudden.

[INFO] Sudden battery drain with marginal or no mobile signal

Hi
This has happened a few times now when my phone is in a place with barely and quite often no mobile signal, always the same place, same building that is in a bit of black spot. On coming back to the phone after an hour or so I've lost 40-50% of battery power, and of course the phone is warm because of the more rapid drain of power. It is the warm phone that alerts me that I've probably had a massive battery drain event again, turning on the phone shows no service, the service comes back fine as I walk away from the building. This rapid drain event never happens elsewhere, but then normally I'm getting a decent signal everywhere else.
The battery chart shows the drain clearly, and as soon as the phone is back in a decent signal area the drain immediately stops and is back to normal battery usage apart from having lost half of its power.
The battery usage shows the phone was hardly sleeping for the duration of time in the low/no signal area, presumably kept awake by the radio chip constantly reporting no signal or something like that.
I'm using the stock ROM in Europe on Vodafone, software version 1.29.401.11.
Surely it isn't normal for the radio chip to cause so much battery drain in a no/low signal area, where is it trying to reach for a signal, Mars? :cyclops: My other smart phones same carrier in the same place with the same no signal situation were absolutely fine and didn't do this.
Interestingly the cell power usage percentage doesn't increase for this problem, so while the cell power usage is half the battery when this event occurs, this doesn't register in the cell power usage percentage, or anywhere else for that matter, just the overall chart takes a dive down.
Perhaps this issue explains variable battery life some are experiencing if they are in or travel through areas of poor or no mobile signal. Something isn't quite right with the way the radio is dealing with this situation, hopefully fixed in the next update.
Regards
Phil

Same thing is happening with my 1X. I'm working in such a building too for the last couple of weeks, it's very annoying.
I'm also on Vodafone from the Netherlands
Sent from the HTC HD2

On Vodafone in the UK and also get bad drain when signal is poor. Signal does affect battery drain though.

Same when the phone is resting in a low wifi signal with wifi on: massive battery drain in that case. Extremely annoying!

Hi
I've updated my One X with the newest RUU that contains the latest radio 2.120, this is a stock ROM for European unbranded phones and installs without needing a rooted phone.
This radio was pushed to some places in Europe last week I believe but we haven't had it in the UK.
I'll see how it goes, but it is very annoying and certainly not right for a low/no signal to drain the phone so quickly.
Regards
Phil

High battery drainage overnight with only 2G off

Got a new battery, original samsung, as I tought my 18-month old one was a little wearing out.
Still, overnight, with only 2G on (so no 3G, no wifi, no sync) I get a 1% drainage per hour, as you can see from the attached pictures:
- in 9h 11m the phone is in deep sleep for 98% of the time still with a discharge rate of 1% per hour
- 100% of time with no signal and no data connection
Kernel and partial wakelock also do not seem a problem, but maybe I don't know how to read this informastion.
Even the cpu is in deep sleep for 98% of the time.
Really do not know if this is normal or not...

thegios said:
Got a new battery, original samsung, as I tought my 18-month old one was a little wearing out.
Still, overnight, with only 2G on (so no 3G, no wifi, no sync) I get a 1% drainage per hour, as you can see from the attached pictures:
- in 9h 11m the phone is in deep sleep for 98% of the time still with a discharge rate of 1% per hour
- 100% of time with no signal and no data connection
Kernel and partial wakelock also do not seem a problem, but maybe I don't know how to read this informastion.
Even the cpu is in deep sleep for 98% of the time.
Really do not know if this is normal or not...
Click to expand...
Click to collapse
no one who can help?

[Q] battery problems?

Hello.
I'm using nexus 7 2013 lte for a couple of weeks and i experience some troubles that quite bother me. Device is running android 4.4.2 installed OTA.
First of all, battery drain in sleep mode is kind of unpredictable. At night (8-9 hours to be exact) device can consume 3%, 5%, 15 or even 20. My first thought was to check installed third-party apps which could cause it. But i didn't manage to find the reason of the problem, the statistics of battery looks OK, tablet can work fine for a couple of days, and then same thing occurs. I found no dependance to 3g and wifi on/off: there can be 3% for night when device is just left with wireless connections, and there can be 10-15% with airplane mode on and precursory reboot. Battery drain happens only in sleep mode, and battery times are absolutely normal on heavy tasks (10 hours of 720p video, 3:45 of gaming). The other device I use works just fine with same apps installed, same settings and cellular carrier: consumption on idle is low and constant.
Some weird jumps in battery level also can be noticed: from current level to 100% and back on: example 1
example 2
No chargers or usb were connected, temperature around was constant. Can't find any reasonable explanation to these jumps.
So should I suspect that my item has any hardware faults of battery, or there can be some software issues?
And another minor question: how good should be wifi reception on nexus? The "other device" I mentioned above (which is galaxy note 2) has solid, good level and speed of connection, while nexus seems quite worse on this subject. For example, in the room where I am at the moment, note has 3/4 bars in wifi symbol and fine, constant speed, and nexus has 1 or 2 bars of 4, and connection looks pretty laggy.
Thanks in advance for any response.

Try factory resetting and testing sleep mode battery consumption again without installing/touching anything. If its a hardware problem, it will happen again. Wifi reception should be the same or better then note normally, but as i said, factory reset and try, if the problem(s) persist, its a hardware problem.

Those battery graph peaks were still present last night.
I've just performed factory reset, will see if it changes behavior of my device.
Thanks!

So, after factory reset on pure system without any non-stock apps I got these results:
Battery consumption on idle was usually between 1 and 1.5% per hour. There was a little of instability (marked red on the screenshot), but just a little. Nothing like sudden 15% per hour that used to happen before. Is 1.5% good enough for sleep mode on stock firmware with 3g(not lte, 3g) and wifi turned on?
No jumps to 100% were noticed during these 24 hours, but they didn't happen every day. They worried me most, so I'll continue to check if they occur again. Hope they disappeared after factory reset.
As for the next step, I gonna install my usual apps and see if it affects battery perfomance.
By the way, about wifi reception: it still had 1-2 bars where galaxy note has 3-4. But then I ran some speedtests, and connection speed on nexus was usually significantly faster then note's. So wifi works just fine, it is just a matter of wifi icon calibration.

For a bit my batt life was suffering. I found it worked to turn it off, charge it fully, and then turn it on again. I actually wanted to know if there r any good task killers for it?

Terrible Battery Life. How Do I Diagnose the cause?

I'm experiencing pathetic battery life on my 10, which is just about a month old. This is without me using 4G LTE at all. Only Wi-Fi + 3G.
- I'm seeing drain in the range of 10-15% an hour with light usage.
- SOT never goes beyond 3-3.5 hours.
- I've installed the GSAM Battery monitor app. But there's nothing out of the ordinary on the stats. Screen always seems to consume about 30% of the battery. Rest is small bits from multiple apps.
I'm going to have to do a factory reset to fix this. But I really don't want to.
Is there any other fix?

bhardwajshash said:
I'm experiencing pathetic battery life on my 10, which is just about a month old. This is without me using 4G LTE at all. Only Wi-Fi + 3G.
- I'm seeing drain in the range of 10-15% an hour with light usage.
- SOT never goes beyond 3-3.5 hours.
- I've installed the GSAM Battery monitor app. But there's nothing out of the ordinary on the stats. Screen always seems to consume about 30% of the battery. Rest is small bits from multiple apps.
I'm going to have to do a factory reset to fix this. But I really don't want to.
Is there any other fix?
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Click to collapse
For me 3 - 3.5hrs SOT was normal on stock. Check settings/location/scanning and turn off wifi scanning that has been known to drain battery

+1 on the wifi scan. That will ghost your battery. I turn off vibration feedback as well along with restricting location permission on most of apps so my phone isn't constantly looking for itself on gps which will also drain battey

Disable FB notifications, wireless and BT scan, wireless notifications and optimalization . Set wifi to never when screen is off
Wysłane z mojego SM-T815 przy użyciu Tapatalka

bhardwajshash said:
I'm experiencing pathetic battery life on my 10, which is just about a month old. This is without me using 4G LTE at all. Only Wi-Fi + 3G.
- I'm seeing drain in the range of 10-15% an hour with light usage.
- SOT never goes beyond 3-3.5 hours.
- I've installed the GSAM Battery monitor app. But there's nothing out of the ordinary on the stats. Screen always seems to consume about 30% of the battery. Rest is small bits from multiple apps.
I'm going to have to do a factory reset to fix this. But I really don't want to.
Is there any other fix?
Click to expand...
Click to collapse
Battery life is subjective.
It'll depend on what you have running, what you restored, the apps and their state, your phone settings, brightness etc. What's connected and what you are doing on your phone..
HTC hasn't historically been the go to phone for great battery life.
A few hours 3-4 SOT is pretty decent for a phone.
You could do the normal things like, switching off connectivity options when not in use, ie location, wifi, data, NFC.
Check what apps are running, for example if Google photos is backing up your pics it's going to hit battery life.. Other apps will do the same, Facebook etc.
I'm not saying don't use your phone but depending on your habits you'll have varying degrees of stamina from your battery.
First thing to do, lighten the load, then grab better battery stats and see if anything is keeping it awake.

i suspect my router here and dhcp lease to be an issue, battery issue happens every dhcp lease (24hrs = 86400) when phone wifi does not turn off wifi after 15 minutes. static ip does not help at all, only rebooting wireless process on router. other than that battery life seems ok - 48 hrs light use.