I have a new Samsung Galaxy Tab 2 7.0. After a few days of use the charge characteristics of the device have become bizarre.
While the tablet is NOT plugged in, the battery indicator slowly INCREASES until it hits 100%. Then it drops to 1% and warns me that the battery is critically low. If I ignore this, the charge indicator again slowly creeps UP (remember, it's still not plugged in).
Here is a screenshot of the Battery History since yesterday:
I tried to insert a screenshot that shows the problem, but since I'm a noob the forum won't let me include the image link. Please see the issue at
paul.net/temp/Screenshot_2012-11-30-13-10-17.png
Notice how I only plugged it in briefly the first time this cycle happened.
The battery indicator is basically worthless. I have no idea what the actual battery strength left is. And I don't trust that it charges correctly.
Has anyone seen this? Any idea what is going on? Any idea how to fix it?
I'm sorry that I'm a noob posting a question, but I haven't found any information anywhere about this strange behavior.
Thanks.
Related
Since installing Cognition, my Captivate's battery life has gotten steadily worse, and I'm reasonably sure that the calibration is off. As it is, even with 3G off, I still barely make it to the end of a regular day. Something's very wrong with the battery calibration. I did flash on a less-than-full battery, which is probably what caused the problem in the first place.
For example: A little while ago, I discharged the battery until the phone shut itself off. I was then able to restart from the same battery two more times (without charging), both times showing 3-4% remaining. The phone stayed on a reasonable amount of time with those charges, and shut itself off nicely when it read <1%.
Just now, i plugged it in, turned it on, and it immediately read 17%. It is now draining at a rapid speed, but it still has too much charge to truly be anywhere near empty. My multimeter reads 3.61v on the 3.7v battery, just for reference.
I recalibrated my battery just yesterday, but there is still a discrepancy between the percent when off and the percent when on. I don't believe I'm actually charging to 100% capacity or draining to 0.
Cutting to the chase: How do I completely zero-out my battery stats and actual charge at the same time for an accurate calibration?
Battery calibration that we follow here is strictly for the OS. Battery too has a chip in it that sends the readings to OS. Let ur battery do its charge-discharge cycles over a couple weeks, and see if its adjusted. Try not to delete ur battery stats again n again. Give both OS and battery to adjust to each other.
Jergling said:
Since installing Cognition, my Captivate's battery life has gotten steadily worse, and I'm reasonably sure that the calibration is off. As it is, even with 3G off, I still barely make it to the end of a regular day. Something's very wrong with the battery calibration. I did flash on a less-than-full battery, which is probably what caused the problem in the first place.
For example: A little while ago, I discharged the battery until the phone shut itself off. I was then able to restart from the same battery two more times (without charging), both times showing 3-4% remaining. The phone stayed on a reasonable amount of time with those charges, and shut itself off nicely when it read <1%.
Just now, i plugged it in, turned it on, and it immediately read 17%. It is now draining at a rapid speed, but it still has too much charge to truly be anywhere near empty. My multimeter reads 3.61v on the 3.7v battery, just for reference.
I recalibrated my battery just yesterday, but there is still a discrepancy between the percent when off and the percent when on. I don't believe I'm actually charging to 100% capacity or draining to 0.
Cutting to the chase: How do I completely zero-out my battery stats and actual charge at the same time for an accurate calibration?
Click to expand...
Click to collapse
If you are on the newest version of Cognition with DG's Cog kernel there is some trouble with it. DG knows about it and is working on a fix. You'd know that if you are reading the Cog thread.
ROM-specific posts should go in their matching sticky in the Q&A subforum. Had you looked in there you would have seen the battery issues with the current version and that DG is working on it.
A search of battery stats would also have answered your question about that aspect. SGSTools allows you to delete battery stats easily.
I guess it might have been faulty to assume that this is a general hardware problem, but I'm not using the newest build of Cog. I'll check my version and then read the release log in the thread l, then. In the meantime I'll go through a couple charge cycles before making any judgements.
Please post in the threads already opened.
On that note, thread closed
Does your phone require a bump charge to actually get the battery to 100%?
Unfortunately mine does. I had an incredible and am familiar with this process. Unfortunately my Charge told me that I was at 100% when it was really closer to about 60%. I know I was at ~60% b/c I turned the phone off and plugged it in and the batter icon showed about that percentage full.
Not too happy about this. It would suck if I have to have the phone off to get almost half my battery full.
Any fixes? Is it possible its just a fluke since this is one of my first couple initial charges?
Thanks in advance.
I havent had any problems like this. It could be that you got a bad battery...
Khanusma said:
Does your phone require a bump charge to actually get the battery to 100%?
Unfortunately mine does. I had an incredible and am familiar with this process. Unfortunately my Charge told me that I was at 100% when it was really closer to about 60%. I know I was at ~60% b/c I turned the phone off and plugged it in and the batter icon showed about that percentage full.
Not too happy about this. It would suck if I have to have the phone off to get almost half my battery full.
Any fixes? Is it possible its just a fluke since this is one of my first couple initial charges?
Thanks in advance.
Click to expand...
Click to collapse
The android battery meter isn't a pure percentage meter, it also uses statistical history and current useage to guage how much you have left. So if you turn the screen on and pull down the notification area the screen and cpu just went to full use from nill, and the battery is probably a little hot, so with little statistics yet the battery thinks its being drained super fast.
Unplug it when it tells you to and don't plug it in till it asks to be plugged in, this will get you the most accurate battery readings. Otherwise don't worry about it unless its telling you to unplug it and then giving you the low battery dance before you get to your first destination of the day or something terribly bad.
Hi everyone
My problem is.. my DS started to charge slowly.
Now it doesn't really charge slowly, If I check the voltage, I will get like 4220mv but as soon as it reaches that, the charging graph just goes flat.
If say I have charged it to 70% and it started going slow. i switch it off, place on the charger, and the lamp goes green. I turn it on, and it is showing 100%.
I have tried calibrations, diffirent kernels, wiping, factory resets e.t.c.
Another thing is that if I will run a v6 battery calibrator,it will show that actually I should have a 100% charge although a phone is showing only 70%.
So the summary: Phone charges normally when off (when recovery monitors charging), showing the correct voltage when on... But showing the wrong percentage if on charge.
Also sometimes if the battery is like 14% left. And I turn the phone off and then on again, it will show 22% bearing the same voltage as when it was 14%.
Question: Is there any way to tweak the battery indicator so it would show % values same as the v6 calibrator does it or is it a hardware fault, if yes, which part of it ?
This happens to me on my older (original) battery, but not my new one. I bought the second battery when this problem started happening. So, I think it's just a symptom of an old battery.
By the way, if you leave it on charge long enough, it will eventually jump up to 100%.
Other than this weird behaviour, it has no real impact on anything.
Sent from my Nexus 7
Thought so, mines been acting similarly lately, but strangely enough it seems to be getting better
I think I found out..
I actually purchased a new battery recently, because my old one was jumping like crazy and started discharging in a few hours..
This new battery I bought from a mobile repair shop.
It is a cheap chinese battery with no name, anyhow I just took it out to take a look at it...
And guess what, it sais 1200mah..
Can the phone be confused because of that ?
Hi. I searched for an answer to this weird problem but couldn't seem to find a similar issue. So here it goes.
When my phone is off and I plug it to recharge the battery, after a due amount of time (or even the whole night) the indicator shows a full green battery and states 100%: fine. But ... as soon as I turn the phone on, the percentage indicator in the top right every time shows a figure between 82-84%. So I need to plug the charger back on again (this time while the phone is on) and after a while I get the 100% on the indicator.
This has happened since I bought the device and with both my (new) batteries. Pointless to say, I did try to reset the battery stats a number of times to correct the issue. No joy.
Am I the only one experiencing this? Any clue on how to fix this discrepancy? Granted it's not a big deal, but still a little annoying.
Thanks
Mike
wallace108 said:
Hi. I searched for an answer to this weird problem but couldn't seem to find a similar issue. So here it goes.
When my phone is off and I plug it to recharge the battery, after a due amount of time (or even the whole night) the indicator shows a full green battery and states 100%: fine. But ... as soon as I turn the phone on, the percentage indicator in the top right every time shows a figure between 82-84%. So I need to plug the charger back on again (this time while the phone is on) and after a while I get the 100% on the indicator.
This has happened since I bought the device and with both my (new) batteries. Pointless to say, I did try to reset the battery stats a number of times to correct the issue. No joy.
Am I the only one experiencing this? Any clue on how to fix this discrepancy? Granted it's not a big deal, but still a little annoying.
Thanks
Mike
Click to expand...
Click to collapse
What might be happening is that your device uses a lot of power in order to boot up. 16% of battery life seems a bit strange though.
The other thing that might occur is that the threshold for the green light to be lit is at about 84-86% (meaning: if the battery is more than 84% or something charged, show the green light).
What I suggest doing is just leave your phone on all the time and perhaps reboot it only when necessary.
As far as I know, there aren't really any solutions, but maybe you should try contacting support from the manufacturer of your device. Perhaps they know more about the subject.
Thanks exenia121,
It's definitely a weird thing. And i was more curious to know if I was the only one to report this. There must be probably a strange surge on boot up. In fact after the recharge of the phone (while being on) was completed (100%) I turned it off. But when I powered it after a couple of hours I was back at 84%. Hmmm ....
Hey there!
As the title implies, I'm facing a very curious phenomenon: when the phone turns on (be it after a restart or just turning it off and back on) the battery percentage indicator increases, e.g., from 47% to 50%. It happens more often than not; otherwise, battery life seems ok.
Just curious - I've had phones lose a percentage or two after a restart, but never seen one jump up!
Running stock A13, December patch, no battery monitoring apps installed. The "problem" even persists after flashing a full factory image.
Latverian said:
Hey there!
As the title implies, I'm facing a very curious phenomenon: when the phone turns on (be it after a restart or just turning it off and back on) the battery percentage indicator increases, e.g., from 47% to 50%. It happens more often than not; otherwise, battery life seems ok.
Just curious - I've had phones lose a percentage or two after a restart, but never seen one jump up!
Running stock A13, December patch, no battery monitoring apps installed. The "problem" even persists after flashing a full factory image.
Click to expand...
Click to collapse
Is it plugged in?
biggiesmalls657 said:
Is it plugged in?
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Click to collapse
I checked, double-checked then checked again - no cable, charger and socket in sight.
It was on battery...
It does reset your stats when you reboot
Battery percentage is dynamic and and the percentage is just an estimate. Like a wrist HR monitor, it's really useful for trends and general ideas about where the rate is around, but it's not an exact measurement. I've had a couple phones do this and it's pretty normal since the phone updates on what I assume to be based on the instantaneous rate of change given the function that android uses for calculating the battery percentage estimates when it reboots, or perhaps when it kicks on the cores for use.
Same here, after taking it from the wireless charges often it goes up 1%. Perfect, free extra on-time!!