Battery drop during charging? - Asus Transformer TF700

My tf700 sometimes drops to 97% while using it charged, is this normal?

I haven't had this happen, but I wouldn't say it's abnormal yet. Try letting the tablet die, then fully charge it with it off. Then letting it die again. Hopefully it should get your battery back to normal.
Sent from my SPH-D710 using xda app-developers app

nlunlun said:
My tf700 sometimes drops to 97% while using it charged, is this normal?
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Yes. Trying to keep a Li-ion battery at 100% charge all times is bad for the battery.

Yes that's normal. The charger only charges to 100% when sleeping. Every other time it goes to 97% to spare the battery, plus usage eats about 3% anyway.. (Lithium-Ion batteries live longest when kept between 60 and 90%. Fully draining and charging is actually rather bad for it. The only reason you do it once or twice is to recalibrate the battery-level indication.)

It is very difficult to fully drain a mobile devices battery. Notice if you attempt to power the device on it after it "dies", it will notify you the battery is too low, thus the battery is never "empty".
Sent from my SPH-D710 using xda app-developers app

thanks for answering!

ShadowLea said:
Yes that's normal. The charger only charges to 100% when sleeping. Every other time it goes to 97% to spare the battery, plus usage eats about 3% anyway.. (Lithium-Ion batteries live longest when kept between 60 and 90%. Fully draining and charging is actually rather bad for it. The only reason you do it once or twice is to recalibrate the battery-level indication.)
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It does go to 100% and sometimes drops to 97% though.

nlunlun said:
It does go to 100% and sometimes drops to 97% though.
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Do you have WiFi enabled when it drops?

ShadowLea said:
Do you have WiFi enabled when it drops?
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Yes, it's enabled and on performance mode. Is it just my tablet?

Ive seen that my TF700T does the same thing.
Sent from my ASUS Transformer Pad TF700T using XDA Premium HD app

nlunlun said:
Yes, it's enabled and on performance mode. Is it just my tablet?
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Ah, there we have it. WiFi drains the power like a vampire. (The folklore kind, not the sparkly ones. ) That's what's causing the drops, with WiFi on the battery lasts about 3-4 hours as opposed to 9. Performance mode spikes the CPU from 1.5ghz to 1.8ghz, and that also drains more power.
There's nothing wrong with your tablet's battery.

Related

Battery over night?

I'm curious I recalibrated my battery to last longer I usually lost around 7-10 percent over night. Now after calibration I only lost 3% and this is what my consumtion was and was curious is this normal or good. I'm getting 43% cell standby, 40 phone idle, 15% display and 2% OS. I was going to post a pic but is not letting me right now.
Sent from my Inspire 4G using XDA Premium App
With my stock rom, I usually use about 3% over-night when the phone is shut-off.
So, either the stock batteries suck, or "off" doesn't really mean "off." I'm assuming the latter, since we have to pull the darn battery to get a true reset.
3% overnight sounds reasonable. Same here.
Sent from my Desire HD using XDA App
zuriken said:
With my stock rom, I usually use about 3% over-night when the phone is shut-off.
So, either the stock batteries suck, or "off" doesn't really mean "off." I'm assuming the latter, since we have to pull the darn battery to get a true reset.
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Maybe you have fast boot on. Or it sucks up a lot of juice just turning it on
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codyperez86 said:
Maybe you have fast boot on....
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Sure do (enabled by default). I'll switch it off tonight and see if the percentage changes in the morning.
so is fast boot something we want on or off?
I look at fast boot as hiberateing. Take that off and I believe your phone will actually shut down all the way. Fast boot is fast boot. After shutting it off and turning it back on and starts up quicker. Sounds like something that would suck a little bit of battery life over night.
Sent from my Inspire 4G using XDA Premium App
With fastboot disabled and the phone shut off, you should see 0% to maybe 1% battery drain overnight.
henrybravo said:
With fastboot disabled and the phone shut off, you should see 0% to maybe 1% battery drain overnight.
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Yeah I think its from powering down and back up that's it.
Sent from my Inspire 4G using XDA Premium App
To recalibrate it I just powered up to 100% powerdown, unplug chord reboot into recovery go to advance and go to wipe battery bin. Reboot amd you should have a more accurate battery %. You should 4.2V at 100%
Sent from my Inspire 4G using XDA Premium App
3% is more than reasonable.
I lose like 1% per ~2 hours standby with active 3G data connection, and gmails pushing emails.

Charging phone at overnight is bad?

Hey forums, very simple question is charging the phone overnight bad for the infuse? I always get a warning to plug out the phone in the morning. Can overcharging be bad for my battery? Merci.
Sent from my SAMSUNG-SGH-I997R
No, charging overnight is fine.
Sarius24 said:
Hey forums, very simple question is charging the phone overnight bad for the infuse? I always get a warning to plug out the phone in the morning. Can overcharging be bad for my battery? Merci.
Sent from my SAMSUNG-SGH-I997R
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Do you mean that you get a warning after leaving it plugged in all night?
If so, check to make sure that your cable is connected properly. On some cables, the connectors are not fully touching.
What I was trying to say is. Usually the battery is able to charge fully overnight. But then it probably just sits there with the charger in until morning when I pull it out. I was wondering if the extra time its charging on full battery is bad.
Sent from my SAMSUNG-SGH-I997R
Nope, its not bad, whenever the phone reaches 100% it disconnects the charger till it drops to 95%,then it starts charging again and so on,at least that's the case with my phone on official and custom roms
Sent from my X8 using xda app
Nope i've had 20 diff phones and never followed charging cycles and all that let your battery run down and charge it up nonsense. Never had any battery issues ever with any of my phones
GGXtreme said:
No, charging overnight is fine.
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+1
I put it on charge when I go to bed, and unplug it when I wake up. Just make sure to keep it in open where the phone isn't covered.
Thanks for the responses! I wont worry about this anymore.
Sent from my SAMSUNG-SGH-I997R
Make sure to always use quality, reputable chargers and not the ones you buy at the flea market that say "Made in the Democratic Republic of the Congo".
Lol no problem. I still have the charger that came with it
Sent from my SAMSUNG-SGH-I997R
Battery
Yes it is bad, because it will overcharge your battery. It takes a while, but if you overcharge your battery constantly then the battery life slowly starts decreasing until it dies.
SSBB freak said:
Yes it is bad, because it will overcharge your battery. It takes a while, but if you overcharge your battery constantly then the battery life slowly starts decreasing until it dies.
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In a sense this is correct as the same as playing on your phone while its charging I wonder if we have a unplug app when I was on the evo we had a app that would disconnected the charger when full and wouldn't read it until the battery was at 80%
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SSBB freak said:
Yes it is bad, because it will overcharge your battery. It takes a while, but if you overcharge your battery constantly then the battery life slowly starts decreasing until it dies.
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The phone doesn't actually charge the battery to 100% unless you're using an SBC kernel. You can leave it on the charger as long as you want and it will never overcharge unless you have some kind of malfunction.
Been only charging overnight since I got the phone last May.
Sent from my Samsung Infuse 4G - 1.6ghz
I use my phone as alarm and it charges every night since I've had it. No issues with battery unless I flash a rom that is a battery hog.
Sent from my SGH-I997 using XDA App

So whats the best method for a first-time battery charge?

Do i let the phone shut off from the battery reaching 0%, then charge it to 100% and be on my merry way?
I've read multiple theories, but I think u should take it down out of the box, then shut off and charge to full...I remember ASUS recommending that to a media outlet when the Transformer 300 came out a few weeks ago...so that is what I am going to do when I get mine.
Thats exactly what I did, I let mine completely die and then charged to 100%.
Be careful with how you charge the phone, rather with how low you let it get.
Depending on how technical you want to get about it purposefully letting a battery drop to absolute zero can cause some odd chemical reactions that while not immediately evident can some times shorten battery life.
I would recommend taking it out of the box and using it until it is low but not dead. Maybe 10 or so percent and then either turn it off and charge it or leave it on and charge it just do not pull the plug on the charger until it is at 100%.
Valdeck said:
Be careful with how you charge the phone, rather with how low you let it get.
Depending on how technical you want to get about it purposefully letting a battery drop to absolute zero can cause some odd chemical reactions that while not immediately evident can some times shorten battery life.
I would recommend taking it out of the box and using it until it is low but not dead. Maybe 10 or so percent and then either turn it off and charge it or leave it on and charge it just do not pull the plug on the charger until it is at 100%.
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This.
Full battery cycles are not good for long term life of Li ion batteries.
Also, its unlikely, but occasionally happens where discharging the battery to shutoff will render the battery unable to take a charge. The safety circuit on the battery is supposed to prevent this, but its not failsafe. I've seen more than a few reports on previous HTC devices where this happened. And since the battery on the One X is not easily replaced, the result can be disastrous.
The battery meters on phones are not very accurate in the best of circumstances. No need to drain to shutoff, 10 or 20% is fine. No value added to draining to shutoff, and the consequences can be very bad.
Drain to 10% or even 20%, charge to full, repeat 2-3 times. This is done just to calibrate the battery meter on the phone. Its a misconception that you can somehow increase battery life by "conditioning" the battery. But modern Li ion batteries do not suffer from memory effects, and conditioning only works for older tech NiCad batteries.
I do the same thing for all of my phones.
1. Activate and mess the heck out of it until it dies completely.
2. Charge it up to 100%
3. Mess the heck out of it again until it dies completely.
4. Charge it up to 100%
5. Mess the heck out of it again until it dies completely.
6. Charge it up to 100%
Then use it normally
Mine came dead! it didnt even turn on. so I'm charging it now
mehdi_s82 said:
Mine came dead! it didnt even turn on. so I'm charging it now
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That stinks. It must have been on in the box like that other xda member on here claimed
Sent from my MB860 using xda premium
Mine came with 1% battery so I just turned it back off and now I'm charging it up, i think the led will turn green when it's ready
Sent from my SGH-I897 using Tapatalk
How do you tell if the phone is charged to 100% while off?
While on, my battery percentage doesn't seem to go past 99%. Is that correct or is this last 1% just taking a very long time?
Update: NVM last 1% just took forever. LED does turn green when fully charged.
Sent from my GT-P7510 using Tapatalk
The LED will turn green once it's 100%.
Don't worry about letting the phone die and charging it up to 100%.
These batteries don't have a "memory" like older phones
mehdi_s82 said:
Mine came dead! it didnt even turn on. so I'm charging it now
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Mine came dead too. Charged it to 100% and now been using it and so far have 36% on 3h 9m on battery.
Screen at 84%
Does the battery life get better? Because it seems to be draining rather quick. Even though I have screen brightness less than half.
jshahanii said:
Thats exactly what I did, I let mine completely die and then charged to 100%.
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truciet said:
I do the same thing for all of my phones.
1. Activate and mess the heck out of it until it dies completely.
2. Charge it up to 100%
3. Mess the heck out of it again until it dies completely.
4. Charge it up to 100%
5. Mess the heck out of it again until it dies completely.
6. Charge it up to 100%
Then use it normally
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Maroon Mushroom said:
Don't worry about letting the phone die and charging it up to 100%.
These batteries don't have a "memory" like older phones
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@Maroon Mushroom, Correct these lithium batteries dont have memory effect, but over discharging them will shorten its life.
I dont want to sound like an expert, but discharging the battery until it dies is not recommended. It will affect battery life/performance.
A couple of good references here: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
http://batteryuniversity.com/learn/article/discharge_methods
http://batteryuniversity.com/learn/article/how_to_charge_when_to_charge_table
Ya, we use Lithium Ion (Li-Ion) batteries now which dont have a memory. The older Lithium Polymer (Li-Pol) batteries did have a memory and needed a certain charge method to get the longes life cycle out of it.
Awesome, thanks everyone
I turned it off at 20% and wen't to go buy my MicroSIM (ugh...) cant wait to play with it tomorrow
Why would you buy it? Pretty sure they would give one to you for free
Sent from my SGH-I997 using xda premium
bought it off Kijiji
It's offered by Rogers, but i'm on Telus
Hmm, i hate the idea of letting it die completely. But what i've always done is turned everything on and ran it through a low-powered usb source so it has a charge but the battery is still draining. So even if the battery runs dead it has power via USB plug [make sense?]. Usually having everything on [i do mean everything] and downloading a torrent so the internet is constantly under use. Then again i'm not sure how the One X will work out for this, but thats what i'm planning .
guys its lithium...u cant drain it to 0...even when android shuts down your at around 3.6volts. thats definetly not 0volts. no memory and android wont let you ruin your battery...so charge however whenever.
im qualified in lead acid. ni cad. nimh and lithium batteries. trust me..u cant hurt it unless you short it! !
Sent from my SGH-I897 using xda premium

Is it safe to charge the battery overnight?

Is it safe to charge the battery overnight?
I mean, charging more than 100%, charging over the 3-4 hours needed, charging for 7-8 hours..
I think it won't effect it cuz i charge my phone from overnight too.nothing happens.
when battery gets full it stops charging after that
Of course
I've been doing that for a year.
Usually my battery reaches 10% at the end of the day, then I just leave it charging over night.
Thanks, i've been doing it since I bought the phone but I've never really cared until now..
Do you guys turn off the phone before charging overnight?
No. I don't know how does it affect the quality/capacity of battery though!
I remember as a kid I had those RC-cars and there were always warnings about how it will 'destroy' the battery if it is charged for too long. lol.
I don't have any battery problems.
Just make sure your LED isn't turned on!
I once forgot it on overnight...
It's a little dimmer now. :c
They said once it reachs 100% to stop charging. It can have an negative impact on your battery. Lithium technology or not. But I do it too. I think it just shorten the life span on a slow scale.
Sent from my Galaxy Nexus using XDA Premium 4 mobile app
info[]box1 said:
They said once it reachs 100% to stop charging. It can have an negative impact on your battery. Lithium technology or not. But I do it too. I think it just shorten the life span on a slow scale.
Sent from my Galaxy Nexus using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Here is the thing...
Yes the phone has a voltage shut off when it reached 100%.
However, it will start to drain battery immediately once it cuts off charging. Even when idle with teh screen off it uses some power. And once it drops to 99% it will start charging again until it reached 100%.
Depending on your set up and how much the phone runs when idle it would keep 'topping off' the battery several times overnight. This is harsh on the battery.
So it's not like once it cuts off charging it stays off until it's unplugged and replugged in. It'll keep charging everytime it drops to 99%
Read this.
http://www.strumerjohn.com/apps/blog/show/32094931-how-your-smartphone-battery-works
Sent from my 16GB Blue Verizon Galaxy S3 running MIUI v5 with KT kernel

Moto G battery drain.

Hello. My Moto G since I bought it has some major battery issues. It charges very slowly on the USB charger and a range of wall chargers. One night the phone turned itself off within 10 minutes of me putting it down from 35% battery to 0%. Then last night I was charging it and saw it go from 65% to fully charged in a split second. From the moment I unplug it after full charge, it will last 7 hours with moderate use. Mainly msging on whatsapp andbrowsing in chrome. So I do use it a lot in those hours whilst I'm out etc but it seems to drain whilst it's in my pocket with the screen off. The screen on time has never passed 3.5 hours with brightness on lowest.
I don't find that too bad but the random flash drainage and charging of the battery I have experienced is concerning. I mainly have 3G/H+ on and very few apps other than whatsapp and instagram plus chrome. I have tried a factory reset too. The battery usage stats is just my screen And the usual stuff.
I really think you should considering buying a new charger.
Sent from my XT1032 using xda app-developers app
If not a new charger, return it... :S
Sent from my XT1032 using Tapatalk
Agreed, just return it, it's clearly faulty.
techguyone said:
Agreed, just return it, it's clearly faulty.
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It seems pretty common this battery issues with Moto G, i was considering buying one but now i'm not so sure..
Hmm, today I carged with iPad charger (2A) and after unplug, half hour later (autosync is disabled, no games, no music, no chat etc, all possible apps disabled, not rooted) checking once email the battery level was 87%.
Strange.
I read somewhere that charging at 2A well degrade the battery with the benefit of charging it faster. Is this true?
Sent from my XT1032 using XDA Premium 4 mobile app
shure2 said:
I read somewhere that charging at 2A well degrade the battery with the benefit of charging it faster. Is this true?
Sent from my XT1032 using XDA Premium 4 mobile app
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There is current limiting built-in, with Li-ion so you won't damage or over-charge.
However, heat generated by long-term charging can degrade the battery....
See this:
Battery Charge Levels
Quite simply, it is not possible to overcharge a cell phone battery. However, leaving it plugged in for more that 24 hours can cause it to overheat, thereby shortening its overall lifespan. Most Li-ion batteries and chargers contain internal circuitry that stops the charging when it hits 100 percent, but always unplug it after long charging intervals, just to be safe.
Read more: http://www.ehow.com/way_5296846_can-overcharge-cell-phone-battery.html#ixzz2nMs18x00
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Click to collapse
Hi,
The battery in my moto g, the system oper. android drain a lot of % usage, 34% more than display in 6h usage.
In most cases this drain over 5 or 10% battery. What can be responsable for this consumption ?
my battery status:
5h usage - 32% screen (1h) sist oper.(35%) 4h
regards

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