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Old January 5th, 2013, 12:59 AM   #1 (permalink)
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Default Alarm Clock Battery Drain issue

Issue:

Set an alarm on the stock app at night before going to bed and the battery runs down before the alarm goes off.

Requires a restart to fix the problem even after the alarm is turned off or deactivated.

Device and system software info:

Carrier AT&T
Model SGH-I747
Android version 4.0.4
Kernel version 3.0.8

Troubleshooting to date:

1) Started with a device that had a battery drain issue in addition to this one. Phone was effectively a pocket warmer.
1a) Got a new battery from AT&T, no success.
1b) Factory reset, no success.
1b) Got a new device from AT&T and whatever the other issue was didn't exist on the new device. Getting 48-72 hours out of the new device provided I don't set an alarm on the clock app.

2) Set the alarm on the stock app with new device. Same issue.

3) Downloaded new alarm app. Alarm Clock Plus V.5.1.
3a) Set the alarm, same issue, battery dies overnight.
3b) Unset the alarm, recharged a bit, monitored battery usage. Device continued to eat battery at a higher than normal rate even after Task Manager RAM clear.
3c) Device required restart to clear the problem.

Battery drain stats:



Period 1-2 (3.5 hrs)

Use: None
Alarm: On
Charging: No
Rate: 10.0% per hour discharge

Period 2-3 (0.6 hrs)

Use: No
Alarm: Off
Charging: Yes
Rate: 16.8% per hour charge

Period 3-4 (2.7 hrs)

Use: None
Alarm: Off
Charging: No
Rate: 10.2% per hour discharge

Period 4-5 (1.8 hrs)

Use: Restart then none
Alarm: Off
Charging: Yes
Rate: 24.8% per hour charge

Period 6-7 (6.8 hrs)

Use: None
Alarm: Off
Charging: No
Rate: 0.4% per hour discharge

Period 7-8 (14.9 hrs)

Use: Moderate to normal
Alarm: No
Charging: No
Rate: 1.6% per hour discharge

Summary:

As you can see from looking at the information above, with the alarm set, the discharge rate was about 10% per hour. Even after the alarm was turned off, that discharge rate continued until the device was restarted.

Comparing recharge periods, the recharge rate was about 8% per hour lower (16.7 v. 24.8) before the device was restarted even without the alarm on.

Normal dormant discharge rate was 0.4% per hour. Even with moderate to normal use (web browsing, Tapatalk, various apps, GPS), the discharge rate was 1.6% per hour.

Other points of interest:

By percentage of battery use, the task manager listed cell standby, screen and android system as the largest consumers of battery power. The screen and system usage varied across periods depending on actual use, but cell standby accounted for roughly 45% of use across all periods.

Both wifi and GPS were enabled during all periods. The device was on home wifi for all periods except the roughly 15 hours of Period 7-8. During that period it was on home wifi for roughly half that time, with wifi active during the entire period.

Conclusions:

1) It doesn't seem that wifi or GPS are a player for the battery drain exhibited during the period the alarm was set or the period after, prior to device restart.

2) It seems like turning on the alarm puts the device in a state where it remains on even though the screen is not. Whatever it is doing during that time is sucking down power at a rate higher than actual use. The 10% per hour discharge rate with the alarm set is higher than that of any other period. It isn't even synonomous with heavy use with the display on.

3) This battery drain seems consistent with rates using the stock clock alarm app. I don't think this is an app specific problem, rather an issue with whatever gets turned on in the android system when the alarm is activated.


Any thoughts?

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Last edited by Cantankeris; January 9th, 2013 at 08:27 PM.
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Old January 6th, 2013, 12:04 AM   #2 (permalink)
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Not so much, huh?

Guess I'm on to Samsung support who doesn't understand it either.
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Old January 8th, 2013, 08:41 AM   #3 (permalink)
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cell standby should never be in your top 3 - what did the cell signal bar show? were you in a low signal area?

sounds like battery drain due to poor signal...
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Old January 8th, 2013, 05:06 PM   #4 (permalink)
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Quote:
Originally Posted by quickaudi View Post
cell standby should never be in your top 3 - what did the cell signal bar show? were you in a low signal area?

sounds like battery drain due to poor signal...
Cell standby has always been the largest consumer of battery power regardless of location or device. Thought that was pretty universal for the S3. Your experience different?

Worth investigating, however.
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Old January 8th, 2013, 10:26 PM   #5 (permalink)
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Quote:
Originally Posted by Cantankeris View Post
Cell standby has always been the largest consumer of battery power regardless of location or device. Thought that was pretty universal for the S3. Your experience different?

Worth investigating, however.
You have a 4.8" screen. It should be #1, unless you don't use your phone. The others are usually Android OS and Android System
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Old January 9th, 2013, 02:54 PM   #6 (permalink)
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Quote:
Originally Posted by quickaudi View Post
You have a 4.8" screen. It should be #1, unless you don't use your phone. The others are usually Android OS and Android System
All good but screen wasn't in use during the drain down periods. The 14 hour period it was in use is 14 hrs. The screen use is higher in those periods but still below that of standby in the aggregate.

Had a bad spell yesterday with no alarm activity showing high rates of battery consumption despite low actual usage. Still working to see if poor signal could've been the culprit.

Not clear on what "searching for signal" periods lok like on this phone. Anyone know?
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Old January 9th, 2013, 03:18 PM   #7 (permalink)
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searching for signal is usually red in the signal area shown in the battery settings area
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Old January 9th, 2013, 07:40 PM   #8 (permalink)
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Quote:
Originally Posted by quickaudi View Post
searching for signal is usually red in the signal area shown in the battery settings area
Yeah that's what I thought. Not the case.

I'll post original screen shot in a bit.
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Old January 9th, 2013, 08:30 PM   #9 (permalink)
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Image uploaded to original post. Didn't turn out as sharp as I'd like, but you get the idea. The big dive in the middle when it dips into the red is the two periods of alarm. Punt intended.
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Old January 10th, 2013, 03:01 PM   #10 (permalink)
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you sure you're on Android 4.0.4? Have you not been upgraded yet?
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Old January 10th, 2013, 04:37 PM   #11 (permalink)
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Quote:
Originally Posted by quickaudi View Post
you sure you're on Android 4.0.4? Have you not been upgraded yet?
Yes on 4.0.4.
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Old January 10th, 2013, 04:43 PM   #12 (permalink)
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can you check to see if an upgrade is available?

also, is this a recent issue or has it been happening since you got the phone?
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Old January 10th, 2013, 06:04 PM   #13 (permalink)
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Quote:
Originally Posted by quickaudi View Post
can you check to see if an upgrade is available?

also, is this a recent issue or has it been happening since you got the phone?
Like I said, happened on the phone I had before this one as well. That phone had other problems, as well, so I assumed the alarm issue might not occur on the new device.

I have never set an alarm on an S3 that did not kill my battery before morning.
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Old January 10th, 2013, 08:37 PM   #14 (permalink)
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No 4.0.4 is the latest per the built in upgrade check.

So, your device doesn't have cell standby as the #1 consumer most of the time? What kind of life are you getting from your battery? And, your alarm clock doesn't kill your phone overnight?

Ed: Oh yeah, what's your mobile signal strength show? Settings|About|Status
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Old January 10th, 2013, 08:55 PM   #15 (permalink)
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Can you clear data and cache for the alarm?
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Old January 10th, 2013, 09:34 PM   #16 (permalink)
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Quote:
Originally Posted by quickaudi View Post
Can you clear data and cache for the alarm?
Sure, but I don't know how that would help. It happened the first time the alarm was ever used on the new device.
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Old January 11th, 2013, 08:59 AM   #17 (permalink)
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the other option is fixing permissions, but I'm not sure how to do it in stock bootloader.
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Old March 21st, 2013, 04:25 AM   #18 (permalink)
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I have the same problem with Galaxy S2 4.0.4
I have a daily alarm active on the clock.

The clock is the third most draining appli according to Gsam battery monitor.

I cleared all the data from the clock: settings - application manager. I chose the 'all applications' and found 'clock' After clicking on that, I chose 'force stop' AND 'clear all data' This keeps the app INSTALLED without any sort of hack.

I will come back with the findings on the battery.
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