My Galaxy Tab Pro 8.4 is on a stand on my desk most of the time. I usually leave it hooked up to AC power while on the stand. What's better for the battery: to leave it plugged in, so the battery remains at 100%, and only disconnect it from AC if I'm carrying the tablet around, or to not connect to AC while on my desk and let the battery drain slowly and recharge it, so actually go through drain-and-charge cycles? I've googled this, but I'm finding conflicting information. Are there definitive recommendations in this area?
Thanks!
--Ron
With mine I only charge it if the battery is 50% or lower, Leaving it plugged in with AC connected should be ok, I have a amper cable that shows power draw and when the Battery is fully charged the tablet pretty much draws 0mA with the screen off, and an occasional 20mA probably because of wake-locks or possibly trickle (unsure).
With that being said if the battery does fall below a certain voltage with it plugged it it might switch the charger back on to top the battery off and these micro charges can possibly wear the battery out though I'm not sure if it does this or if it trickles the battery (maybe ill monitor the logcat to see what the battery does when its plugged in)..
anyways key rules to lithium-ion battery's is never completely drain them, don't constantly charge them wait till 50% or less, avoid getting them too hot.
Related
I went to sleep last night leaving the phone to charge with the wall charger. This morning the phone only had a 71% charge and was ultra-hot. These lithium batteries don't like high temperatures.
Anyone else had these high charge temperatures?
It seems faulty ...
I did couple of times charging overnight, and so far so good ... always came back with 100% and cold.
i noticed that if i leave the phone to charge battery down on my leather couch it heats up but on my glass table it is fine think it to do with heat distrabution.
so to save any problems i bought a desk dock charger and never heated up since
Do you have a link to the desk dock you bought?
I was quite disappointed that the Desire couldn't use the Nexus One's stand so I'm interested in the alternatives.
Mine gets very hot when charging from the USB on my computer (and it charges veeeeeery slowly), but using the wall charger it charges fast and stays cool to the touch...
I an charging with the wall charger as we speak with phone on and from 6% and though the phone is very slighty warm it's definately not hot.
Maybe you didn't put the usb in properly and had a bad connection?
Was wifi on?? That affects heat. Any running apps??
Charging with the wall charger normally charges my phone from 10% to 100% in little over an hour while staying cool. I never do anything special to stop apps, last night nothing special was running (no movies or music or heavy cpu stuff).
The heat was located at the lower side of the phone. Under the battery lies the cpu (and gpu) and they were radiating the heat in my opinion, not the battery itself.
Hi guys,
I was playin Temple Run and the battery was about 5% or however close to be fully discharged. Suddenly the display was flickering, or like something this. The phone suddenly powered off.
I tried to charge the phone with the charger in the plug, but after some seconds the animation disappears, then reappears in few seconds and disappears (about when the charger animation goes to the top for the second time).
The GN is connected to the PC, and does not power off: but the charger indication is stuck at 0%
What's happened? I doesn't made something wrong!! I used to discharge my battery often!
I also wiped Battery Stats in recovery, it does not helps.
The ROM and the Kernel are inte signature. I never made overclocks or something like this. Please help me
When I detach the USB cable from GNexus it power off (like when it's normally discharged)
EDIT: Suddenly the % went to 2%.
With lithium-ion batteries like the one in the Gnexus 'like' being charged. They do not have a memory like ni-cad batteries. Severely discharging or overcharging our batteries can physically damage them. If you store the battery for extended times, leave it at 30% charge.
As to why you experienced the freaking out from your phone, when batteries get low on charge, the voltage and amperage output drops. When your phone has a low draw, you won't notice this. Under high draw like gaming, it may not be enough to power your phone. Turn it off and plug it into the factory AC charger. Let sit for at least 30 min or so. Then try to power up.
Sqrls said:
With lithium-ion batteries like the one in the Gnexus 'like' being charged. They do not have a memory like ni-cad batteries. Severely discharging or overcharging our batteries can physically damage them. If you store the battery for extended times, leave it at 30% charge.
As to why you experienced the freaking out from your phone, when batteries get low on charge, the voltage and amperage output drops. When your phone has a low draw, you won't notice this. Under high draw like gaming, it may not be enough to power your phone. Turn it off and plug it into the factory AC charger. Let sit for at least 30 min or so. Then try to power up.
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Thanks. I charged the Nexus with the pc until 10%: now I'm using another plug chargher. Everything seems normal.
Temple Run sucks battery like a...you know.
adrynalyne said:
Temple Run sucks battery like a...you know.
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Yeah. In 30minutes of game the battery went down of about 10%. Web browsing in 3G is less battery expensive
Your battery might be damaged if its acting up when it gets low. Try not to run down to zero.
zippity doo da.
Whenever you get a chance, plug that phone in.
In the car on the way home? Plug it in.
Sitting in the office? Bring your charger and plug it in.
If its under 70% that is. A small charge will always be healthier than 0-100.
Sent from my Galaxy Nexus using XDA
i just experience the same thing i thought i burned out the phone home recharging it will help its look like it stuck on 0%
EDIT : its start recharge also
the way the screen flicker and the sound its made was just the scary
I'm curious if anyone has been using Qi charging with their TabPro? Anyone's comments would be appreciated.
I used a micro-usb Qi coil receiver between my TabPro 8.4 and the Poetic case for a few weeks without issues.
But then something happened to cause the Qi charging pad to overheat. I ended up having to have the TabPro 8.4 replaced by BestBuy as the TabPro would no longer charge at all, even trying different micro-usb cables and 2.1 amp power adaptors. What was even stranger, was the battery continued to drain even after powering the TabPro off! I'm puzzled as to what was damaged, but the end result was the battery went from 41% charge to 7% charge overnight even though it was powered off (not sleeping, but powered off) and not connected to a charger. When I discovered it was at 7% I removed my account info, but even with the charger plugged in, the battery went down to 3% while working on the TabPro. When I checked on it an hour latter it was dead. If I plugged in the charger, after about 20 seconds it would flash the green battery for about a second, then it would go out. No boot, no charging, even after leaving it charging for 24 hours.
So I'm very reluctant to try to use Qi wireless charging on my replacement tab. I suspect the Qi charging pad failed and overheated. There is a spot about the size of a dime where the plastic partially melted on the charging pad. The Poetic case and the TabPro look fine, and the charging pad still acts like it is working. Very puzzling. Any ideas or cautions?
ron12 said:
I'm curious if anyone has been using Qi charging with their TabPro? Anyone's comments would be appreciated.
I used a micro-usb Qi coil receiver between my TabPro 8.4 and the Poetic case for a few weeks without issues.
But then something happened to cause the Qi charging pad to overheat. I ended up having to have the TabPro 8.4 replaced by BestBuy as the TabPro would no longer charge at all, even trying different micro-usb cables and 2.1 amp power adaptors. What was even stranger, was the battery continued to drain even after powering the TabPro off! I'm puzzled as to what was damaged, but the end result was the battery went from 41% charge to 7% charge overnight even though it was powered off (not sleeping, but powered off) and not connected to a charger. When I discovered it was at 7% I removed my account info, but even with the charger plugged in, the battery went down to 3% while working on the TabPro. When I checked on it an hour latter it was dead. If I plugged in the charger, after about 20 seconds it would flash the green battery for about a second, then it would go out. No boot, no charging, even after leaving it charging for 24 hours.
So I'm very reluctant to try to use Qi wireless charging on my replacement tab. I suspect the Qi charging pad failed and overheated. There is a spot about the size of a dime where the plastic partially melted on the charging pad. The Poetic case and the TabPro look fine, and the charging pad still acts like it is working. Very puzzling. Any ideas or cautions?
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The only thing I can think of is maybe the Qi charging pad failed to deliver 2.1 Amps to correctly charge it (I don't think they even make 1 Amp coils yet? - though I could be wrong.) , maybe the tab went into charging mode but it was really discharging since not enough current was going in that it needed to charge + keep the tablet running so in the end maybe it destroyed the battery since it went completely flat which is usually a bad thing for l-ion battery's
Usually when android says the battery is at 0% the battery really has about 20% remaining for protection of the battery and preventing it from going completely empty (l-ion can really be drained to 2.5v but android reads 0% around 3.4v or 3.2v if i remember correctly as protection from flat-lining the batt), however if it was under charging mode I'm sure it would override this as it thinks it's plugged in so it's not paying attention to the battery, but really the batt is draining to compensate for the underpowered charger, that would be my guess maybe constantly using the Qi charger the battery circuitry changed the battery status from lv 2 (good) to ~ lv 4 (bad) since it wasn't receiving the current it was supposed to and the circuitry thought something was wrong with the battery cells or the battery just went bad since it was always under a charging / discharging state never reaching 100%.
on a side note
I found this tablet to be very fussy when using other chargers then its official one, I have tried several chargers and they just dont function like the stock one for example
HP Touchpad charger 5.3v - 2.0A - Very high quality charger and even won some awards for beating out other chargers - I found this would sometimes not fully charge the tablet to 100% it would idle around 98% (I have two of these chargers) - Charge current starts around 1800 mAh drops to 200 mAh when battery gets full don't think its enough to top it off. (charges at 5v)
10,000 mAh Power-bank (5v , 2.0A), found out this would not fully charge the tablet either it would get to 80%, upon further inspection the 2A port was only delivering about 1 Amp of current according to my amp reader (voltage drop to 4.98)
Samsung official charger (5.3v 2.0A)- though seems to start at a pretty high 5.60 volts (higher then other chargers) , and charges at about 1870 mAh , always reaches 100% with this charger. (I have two of these chargers since I bought another one as backup - both do the same thing)
otyg said:
The only thing I can think of is maybe the Qi charging pad failed to deliver 2.1 Amps to correctly charge it (I don't think they even make 1 Amp coils yet?
. . .
Usually when android says the battery is at 0% the battery really has about 20% remaining for protection of the battery and preventing it from going completely empty (l-ion can really be drained to 2.5v but android reads 0% around 3.4v or 3.2v if i remember correctly as protection from flat-lining the batt), however if it was under charging mode I'm sure it would override this as it thinks it's plugged in so it's not paying attention to the battery, but really the batt is draining to compensate for the underpowered charger, that would be my guess maybe constantly using the Qi charger the battery circuitry changed the battery status from lv 2 (good) to ~ lv 4 (bad) since it wasn't receiving the current it was supposed to and the circuitry thought something was wrong with the battery cells or the battery just went bad since it was always under a charging / discharging state never reaching 100%.
on a side note
I found this tablet to be very fussy when using other chargers then its official one, I have tried several chargers and they just dont function like the stock one for example
HP Touchpad charger 5.3v - 2.0A - Very high quality charger and even won some awards for beating out other chargers - I found this would sometimes not fully charge the tablet to 100% it would idle around 98% (I have two of these chargers) - Charge current starts around 1800 mAh drops to 200 mAh when battery gets full don't think its enough to top it off. (charges at 5v)
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That could be the case. Yet, for two weeks, the Qi charging had no problems taking the charge to 100%. It would charge a bit over 15% an hour. The Galaxy Charging Current app reported between 670 and 750ma charging current using Qi charging.
At this point I'll likely never know, but it could be the battery itself simply failed on the tablet. My question is mainly to see if anyone else has used Qi charging, and what their experience is. How can I display the battery status (you referenced lv 2 (good) to ~ lv 4 (bad))? The battery app from the Play Store does display "battery health" but I've only seen it say "Good".
On your side note, I occasionally plug the tablet into the USB port on my computer (measures 5.10V), and it charges at about 10% an hour while sleeping, and has repeatedly charged the battery to 100% when I leave it connected. I have an EnrePlex Jumper Prime 4400mAh that measures 5.18V, and charges at 1.5A. It has charged the battery to 100%, though will run out of juice if the battery is lower than 40% before I use it, it measures 5.18V.
I have an old Galaxy Tab 2 10.1 that I often charge via the computer's USB port, although it takes a long time, and it's battery is still fine after almost 3 years.
ron12 said:
That could be the case. Yet, for two weeks, the Qi charging had no problems taking the charge to 100%. It would charge a bit over 15% an hour. The Galaxy Charging Current app reported between 670 and 750ma charging current using Qi charging.
At this point I'll likely never know, but it could be the battery itself simply failed on the tablet. My question is mainly to see if anyone else has used Qi charging, and what their experience is. How can I display the battery status (you referenced lv 2 (good) to ~ lv 4 (bad))? The battery app from the Play Store does display "battery health" but I've only seen it say "Good".
On your side note, I occasionally plug the tablet into the USB port on my computer (measures 5.10V), and it charges at about 10% an hour while sleeping, and has repeatedly charged the battery to 100% when I leave it connected. I have an EnrePlex Jumper Prime 4400mAh that measures 5.18V, and charges at 1.5A. It has charged the battery to 100%, though will run out of juice if the battery is lower than 40% before I use it, it measures 5.18V.
I have an old Galaxy Tab 2 10.1 that I often charge via the computer's USB port, although it takes a long time, and it's battery is still fine after almost 3 years.
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The battery app from the play store probably does the same thing just shows a status as a replacement of the health, you can see the status with logcat occasionally you will see something like this ---
you might need root for some of these commands., you can use Terminal Emulator , adb shell, or sshd to access these commands.
Logcat::
1.
"D/BatteryService( 934): level:83, scale:100, status:3, health:2, present:true, voltage: 4091, temperature: 234, technology: Li-ion, AC powered:false, USB powered:false, Wireless powered:false, icon:17303447, invalid charger:0, online:1, current avg:-378, charge type:0, power sharing:false"
2. (shell)
dumpsys battery
will output something like this
Current Battery Service state:
AC powered: false
USB powered: false
Wireless powered: false
status: 3 < - unplugged
health: 2 <- health:2 would translate to good , health 1 would be excellent (though I have never seen a 1 status , 3 poor, 4 bad
present: true
level: 83
scale: 100
voltage: 4114
current now: -140
temperature: 248
technology: Li-ion
3. (shell, you can check out other files in the /sys/class/power_supply/battery/directory but be careful not to modify them)
cat /sys/class/power_supply/battery/health
Good
Everyone knows your battery has limited number of charge cycles. My question is, if I leave the charger cable plugged in when I use my tablet at the kitchen counter where there is a charger nearby, what does that do for battery longevity. Is it worse, is it better?
Fist point, is a tablet is not designed to be constantly plugged in like a notebook, the power supply and charging circuit most likely dont have the same durability as an notebook, though some people do put them in cars, and other for display stands for business.
If the tablet is like a notebook, when the battery level goes under 95% the battery will start charging till it hits 100% and then stop, how long it takes to go from 100% to below 95% i do not know, like if you use an game that uses a lot of cpu power will the tablet use some of the battery even though it is plugged it.
John.
Tinderbox (UK) said:
Fist point, is a tablet is not designed to be constantly plugged in like a notebook, the power supply and charging circuit most likely dont have the same durability as an notebook, though some people do put them in cars, and other for display stands for business.
If the tablet is like a notebook, when the battery level goes under 95% the battery will start charging till it hits 100% and then stop, how long it takes to go from 100% to below 95% i do not know, like if you use an game that uses a lot of cpu power will the tablet use some of the battery even though it is plugged it.
John.
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Ugghhh...
To OP, there are no problems leaving your device plugged in. ALL the charger will do is constantly trickle a low-current "top off" charge to the device, maintaining it at 100%. This does not adversely effect modern lithium-ion or lithium polymer batteries. If this were 1995 and we were discussing nickle-cadmium batteries, it would be a diffent story. But, here we are in 2015.
You should not trickle charge an lithium polymer battery, just look at the results below, anyway keeping your tablet plugged in constantly is not a problem.
https://www.google.co.uk/#q=trickle+charge+an+lithium+polymer+battery
John.
John.
When I go to sleep at night, I usually leave my phone plugged in until I wake up. I need my phone to have a full battery when I awake, and this is the only option that I know of. I was wondering if there is a way to force the phone to charge a little more slowly so that it isn't sitting plugged in on the charger with a full battery for a few hours until I wake up, as I understand this can damage your battery and reduce longevity. Anyone have any suggestions?
Maybe you could use a low amperage charger?
With original charger (1.2A if I'm not wrong), it took nearly 6h for my phone to fully charge (while it was new and on factory software). Even the charger is declared as 1.2A, charging current never went over 700mA so you can safely leave it on charger, with no worries... Devices do have a overcharge protection, and simply will stop charging second battery sensor gives "Full" state (you can test that with Ampere - you'll get the charging current and see that even after 100% is reached, battery continues to charge for a while, until "Full" state is set by the sensor). Battery quality will deteriorate no matter what you do - they are made to survive some number of recharging cycles and that's it - mine suddenly started loosing capacity fast, after 2.5 years (or around 1000 cycles), out of blue, and you can just replace it. Same story with other phones I have/had: simply, after 2.5-3y their batteries start loosing capacity rapidly.
I would not recommend weaker charger (under 700mA) because our device has 250-400mA drain during idle, and if you want your phone to be full same moment you're awake, you may get a nasty surprise of "Charging" status Anything around 1A is more than enough.
Thanks so much! That answers my question.