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Why is my Galaxy S2 battery so poor? - Page 2

post #11 of 21
What version of android are you running I.e Gigerbread, ICS ,JB?

Try out this app - Better Battery Stats >>> https://play.google.com/store/apps/details?id=com.asksven.betterbatterystats&hl=en OR http://forum.xda-developers.com/showthread.php?t=1179809

Description
With BetterBatteryStats you can analyse the behavior of your phone, find applications causing the phone to drain battery while it is supposed to be asleep and measure the effect of corrective actions:
- Spot drainers based on detailed information about the root cause
- Use the online Knowledge-Base to find how to reduce or remove the wakelocks
- measure the effect of actions to reduce drain
- detect changes in the awake/sleep profile and quickly find the causes (rogue apps)
In other words BetterBatteryStats helps you to get the best out of your Android smartphone.
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post #12 of 21
Quote:
Originally Posted by mark_thaddeus View Post

First off, when you got the phone did you do a proper dis-charge and charge to prime the battery?

It's always good practice that when you get a new phone to completely drain it first. Once drained, charge the battery in the OFF state for at least 8-10 hours. Now this should be done at least 3 times (meaning you let it drain completely 3 times) and you're battery should have been properly primed after that.

DO NOT DRAIN THE BATTERY COMPLETELY, EVER!
DO NOT CALIBRATE THE BATTERY, EVER!!
not sure where you got your info from but lithium batteries of any make degrade once they go below 20%, and very rapidly.

if you want to prolong the life of the battery, best bet is to never let it get below 30% i personally just stick the phone on the charger as soon as it is not in use.

if you want the phone to last longer between charges, you can buy a higher mAh battery.
on the battery itself there will be a mAh rating listed maybe in the 1,600ish range (depending on carrier/merchant), you can find higher listed mAh batteries for your phone and use that for extra 100% to low power.

Further more, calibration is very bad for Lithium Ion, LiFePo4, LiMnNi, LiNiMnCo Cells. pretty much what this does is drain your batteries then recharges them.

**** Both Draining battery method and Calibration are for NiCd or NiMH cells ONLY!!!! ****

anyone else that tells you different is wrong!!!

further more, you cant even discharge a cell battery because of the protective circute in them that stops voltage from draining at ranges from 2.2 - 2.9v
the only thing you'll accomplish is, rapidly reducing the batteries life span and mAh.
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post #13 of 21
From my experience (G1, MyTouch 3G, Droid Incredible, Galaxy Nexus compared to iPhone 4 and Lumia 920) Android has always been poorly optimized for battery use. Best thing to do is to purchase an extended battery, or turn your phone into a "dumb phone" by disabling all the features that make Android great.
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post #14 of 21
Quote:
Originally Posted by Jollyriffic View Post

DO NOT DRAIN THE BATTERY COMPLETELY, EVER!
DO NOT CALIBRATE THE BATTERY, EVER!!
not sure where you got your info from but lithium batteries of any make degrade once they go below 20%, and very rapidly.

if you want to prolong the life of the battery, best bet is to never let it get below 30% i personally just stick the phone on the charger as soon as it is not in use.

if you want the phone to last longer between charges, you can buy a higher mAh battery.
on the battery itself there will be a mAh rating listed maybe in the 1,600ish range (depending on carrier/merchant), you can find higher listed mAh batteries for your phone and use that for extra 100% to low power.

Further more, calibration is very bad for Lithium Ion, LiFePo4, LiMnNi, LiNiMnCo Cells. pretty much what this does is drain your batteries then recharges them.

**** Both Draining battery method and Calibration are for NiCd or NiMH cells ONLY!!!! ****

anyone else that tells you different is wrong!!!

further more, you cant even discharge a cell battery because of the protective circute in them that stops voltage from draining at ranges from 2.2 - 2.9v
the only thing you'll accomplish is, rapidly reducing the batteries life span and mAh.


I agree and disagree with your statement and I will clarify that in a bit. Even my trusty old LG KU990 Viewty (2007) still works perfectly with the battery showing no signs of degradation with what I've mentioned previously.

I'm sure your quoting this article or a source similar to this:

http://lifehacker.com/5875162/how-often-should-i-charge-my-gadgets-battery-to-prolong-its-lifespan

What I was mentioning is this important bit in the article:

Fully discharge it once a month
This may seem contradictory, but hear us out. While lithium-ion batteries shouldn't be discharged regularly, most modern batteries are what's known as "smart batteries", which means that they can tell you how long you have until your battery dies (e.g. "2 hours, 15 minutes remaining"). This feature can get miscalibrated after a lot of shallow discharges. So, manufacturers recommend fully discharging your battery once a month to make sure this stays accurate.


When I made my statement, it was with the thought that he had never done a full discharge even once in the phones lifetime and needed to do it to help it properly calibrate. As for using the calibration tool, that's what it will actually do as well, but aids you more. It will help you discharge it and fully charge it and even remind you with an audible tone once you hit 100% so you can pull the plug and not worry about over charging it. As for leaving it for 6-8 hours, I was assuming that he has the same charger as mine (since we have the same S2) and it shuts off once it has fully charged the battery, which means it would be safe to leave for that period.

Another thing to note in the article is that you should charge your phone in the OFF position and let it charge to eliminate any parasitic load which can distort the charge cycle.

So what your doing (partially) is actually wrong and right, so before you go crazy with giving information and telling other people they are wrong maybe we should do a little research first. smile.gif

On my end, I'll make sure to be more specific and give proper quotes to information to back my claims. thumb.gif
Edited by mark_thaddeus - 4/4/13 at 7:42am
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post #15 of 21
only cells with over and undervoltage protection are considered "smart"
however these batteries do not calibrate anything, they just stop putting out power at their cut off voltage and stop charging at 4.2v (if the battery is a 3.7v cell)

in short the protective chip on these batteries is only an open/close switch.
think of them like a full time voltage meter.
with batteries that have a protective chip, you'll want to fully charge them before storing them away and monitor their charge as these chips drain power from the cells.

I work with electronics and have developed many protective switches using the schematics of many top brand lithium manufactures.
These chips have been used in many devices ranging from eCigs to Home and outdoor electronics.

i stay far away from any articles about batteries since most are written by people that are either reading or quoting info from invalid sources.

other than what i had stated before, discharging a lithium-ion battery fully can also cause fires and explosions. (that is a much longer discussion and explanation of factors that can cause such a thing to happen however).


many companies still to this day tell people to run lithium phone batteries all the way dead and then fully charge for maximum life span, such as T-Mobile.
gone are the days of correctly telling people how to maintain their devices or equipment due to making money.
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post #16 of 21
I completely understand where you're coming from, I guess I shouldn't have used the word calibrate since that does cause confusion. I also agree that companies do make statements that help them make more money instead of actually caring about the consumers.

I just wanted to clear up something. I never said that anyone should discharge their phone every cycle and I'm completely against that as well.

As for quoting invalid sources, I don't think Battery University (which is quoted by the article I linked) is an invalid source since they're main business is battery testing and analysis. The particular topic I linked actually links to an article with Battery Universtity HERE that (the article) was actually researched by Cadex Electronics which deals with a lot of battery testing. here's their BIO for further details:

http://batteryuniversity.com/about/

As for completely discharging, don't misunderstand my statement because the S2 does have a smart battery in the fact that it does have an over and under volt protection. So when I do say discharge fully it just means that the battery will stop working once it hits about or below 3600mV @ +/- 50mV (I have software that monitors this) and the phone shuts off. That is totally within the safe zone of Lithium batteries right? Since I know that when Li-on batteries go around or below 1500mV and stay like this for a week or more, Copper shunts may have formed inside the cells that can lead to a partial / total electrical short. If recharged, the cells might become unstable, causing excessive heat or other anomalies. I also know that at 2700 mV/cell or lower, the battery’s protection circuit puts the battery into a sleep mode. This renders the pack un-serviceable and a recharge with most chargers is not possible.

As for over charging, the S2 also tops off (mine tops off at 4185mV) at around the 4200mV (+/- 50mV) threshold of Li-on batteries and it does not trickle charge which is good. I know that trickle charging to ensure the battery is always full, is a bane for a lot of Li-ons since this causes undue stress on the battery and degrades it further.
Edited by mark_thaddeus - 4/5/13 at 7:09pm
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post #17 of 21
I just wanted to point out that the Calibration method generally used for android phones is as follows

With phone on, charge till it says full.
Turn off phone, unplug charger.
Plug charger back in, wait till it says full.
Unplug charger, turn on phone, and plug in charger till it says full again
unplug, turn off, plug back in
and repeat till the time between power on and charge full, and power off charge full becomes very small.

What it does is it makes the phones internal battery stats find out what true 100% is.

Also, never let your battery drop too low (below 20-30%, but never charge it when it's too high (above 50%)
I always get the best battery life by doing so
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post #18 of 21

make sure to set options for your Apps like Email and weather - for the 'refresh interval' .. those are likely the 'wakes' you are seeing on your battery page.

 

ie- most weather widgets are set by auto to update every hour... change the setting to every 6hrs

 

..same can be done for email updates/accounts, and FB as well as other programs that are waking your phone.

post #19 of 21
What rom are you running?
Better Battery Stats as was pointed out to you in an earlier tread will show you exactly what is not allowing your phone into a deep sleep state.
Really sounds like you have a wakelock.
I'm using a SII i727r, on The Collective 4.2.2 based rom and I get 18 hours of off charger with 2+ hours of screen time a day. With leaving all refresh intervals @ normal before I have to charge it.
I'd take a look at what model your phone is and hit up XDA.
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post #20 of 21
There's nothing you can do. The battery life just sucks on the S2, as with mine.
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