My tab has some problem with battery drain/charging. This happened just over night.
Even if the tab is powered off, the battery is drained within a one or two hours.
First I noticed that when charging, one spot on the back cover is within minutes over 46 degrees hot and charging is very slow (20% after 5 hours). The spot stays hot after removing the charging cable and the tab is powered off, until the battery totally drained.
After removing the cover, the circuit (see picture) is going hot immediatelly after connencting the charging cable, even if the battery is disconnected.
Maybe is this circuit damaged? Any opinion?
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Last week I was traveling, and I ran the battery on my 8125 dry. I got the unit to boot twice, but only for a few seconds, then it blinked out again. It never got past the initial screen. No big deal, I thought, I just charge it at the next opportunity. But when I hooked up the charger, nothing happened. No charging light, and no charging (left unit on charger overnight, tried 3 different chargers). Took the unit to an AT&T store, but they don't sell batteries. Fortunately, the clerk used the same phone and took the battery out of his and put it in my 8125. The unit booted, and when he connected a charger, the charging light came on and charged the phone. I moved it directly to a car charger, and the phone has been fine since then.
Did HTC build in a catch-22 here? When the battery is totally empty, you can't boot the phone and it will not go into charge mode?
Is there perhaps a way around this, other than having a spare battery that has to be kept in a charged state?
If you read around this thread, there are LOTS of posts about this. Yes, the battery in the 8125 is goofy. It'll crap out at you if the power goes below (and I'm recalling from memory, so this may be wrong) 5% of full charge.
Don't drain your battery completely. I usually shut my phone off around 10-15% and only power it when absolutely necessary until it's been recharged. If you drain it dead, it typically won't charge unless you use your AC adapter charger, or in rare cases your car charger. USB doesn't provide enough juice to jump over the dead-battery hurdle. Apparently, in your case, that wasn't even enough.
The best things you can do for yourself is show the actual battery strength on your today screen somewhere (doesn't matter how, or with what). Use something that shows the actual battery strength in linear value, not logarithmic value. This will help keep you from accidentally draining it. Also, like you said, buy a spare battery. My usage isn't that high, I can usually go 2-3 days without charging, but if you're draining it daily, an extra battery is a near absolute requirement.
This is usual for these phones. When battery goes dry it's very hard to charge it. You can wake battery up with atx power supply or similar with 5volt output. Just connect wire from power supply +5 volt line(red wire) to battery + and second wire from power supply ground line(black wire) to battery -. Power on atx power. After 1-2 min your battery is alive and you can boot up your phone and charge a battery.
I left my phone charging overnight via the wall charger. Battery registered at 1% when I started the charge.
When I woke up this morning I had a large low battery icon on the screen and the phone won't turn on. I disconnected the charge, tried charging with another charger but everytime it shows the SAMSUNG logo, then the large low battery icon.
I tried removing the battery, cleaning the charger port terminals, swapped out different USB cords, everything but a hard reset.
No matter what I do the phone will not start up.
Has anyone experienced this before, or possibly no how to resolve it?
mfarlow said:
I left my phone charging overnight via the wall charger. Battery registered at 1% when I started the charge.
When I woke up this morning I had a large low battery icon on the screen and the phone won't turn on. I disconnected the charge, tried charging with another charger but everytime it shows the SAMSUNG logo, then the large low battery icon.
I tried removing the battery, cleaning the charger port terminals, swapped out different USB cords, everything but a hard reset.
No matter what I do the phone will not start up.
Has anyone experienced this before, or possibly no how to resolve it?
Click to expand...
Click to collapse
Happened to me several times (on both my focuses Rogers and AT&T), and I came to the conclusion it's a bug somewhere in the phone or the battery. I'm not sure exactly where the problem is (software, hardware) but I can tell you how I fixed it.
What happens is, the battery is almost depleted, it actually is 1%. The phone incorrectly reads that thinks it's charged fully and doesn't allow further charging the battery. So, you're not able to charge the battery correctly.
Now, as I previously stated in some other posts, I recommend having a standalone charger (Samsung i9000 ones are compatible are very cheap) as well as a secondary battery. The depleted battery gets charged fine in the standalone charger and when it passes 5% charge, it can be charged fine (again) in the phone.
This doesn't happen often, I believe it happened 5 times in more than 300 charging cycles (2 phones x 150 charges, I have them for over a year) so it's not that common.
I also found that it *may* work if you charge the battery in another phone.
As a general thumb rule, it's important not to leave the battery to completely discharge, and connect the charger/usb when it reaches about 40% (when you can, ofc). Please refer to my post here to see how you can preserve battery life.
Yesterday my galaxy s2 battery drained to 0% within a couple of hours and when i got home it would not charge or turn on. No power, boot, recovery or download. It was dead. I have seen the battery charging icon come on for a second a couple of times but it is not charging.
Today i got my Galaxy S (S1) battery and aligned 3 out of the 4 pins with the battery on an angle, then pushed the battery to hold contact. With the usb cable plugged in, All of a sudden the charging battery icon came up!! you must keep holding it but.
ill use this to make titanium backup and cwm nandroid backup, while i send back my galaxy s2 to get repaired.
report back if this works for you!
i believe the problem is either the battery or the usb charging circuit.
i gave the S2 battery some juice with my old galaxy S1 usb battery charger. now it is in the S2 and charging slowly via AC, however battery temperature is reading 66 degrees celcius.. i changed the charging current back to default values (650,450,450)
Worked for me too!
My phone didn't charge overnight -- seemed dead as a doornail.
Stuck in the battery from my old Galaxy S and booted just like yours!
Don't know whether it is the battery or something else yet, but thanks!
bundi22 said:
Yesterday my galaxy s2 battery drained to 0% within a couple of hours and when i got home it would not charge or turn on. No power, boot, recovery or download. It was dead. I have seen the battery charging icon come on for a second a couple of times but it is not charging.
Today i got my Galaxy S (S1) battery and aligned 3 out of the 4 pins with the battery on an angle, then pushed the battery to hold contact. With the usb cable plugged in, All of a sudden the charging battery icon came up!! you must keep holding it but.
ill use this to make titanium backup and cwm nandroid backup, while i send back my galaxy s2 to get repaired.
report back if this works for you!
i believe the problem is either the battery or the usb charging circuit.
i gave the S2 battery some juice with my old galaxy S1 usb battery charger. now it is in the S2 and charging slowly via AC, however battery temperature is reading 66 degrees celcius.. i changed the charging current back to default values (650,450,450)
Click to expand...
Click to collapse
I'm on the latest cm nightly,
I always let my tablet die before charging but this time something odd happened. When I would plug it in the white battery that shows its charging would come on then turn off. If I unplugged and plugged in again the exact same thing would happen.
While plugged in I would try booting up. It would get to the lock screen then power down because it had zero percent charge.
I figured out if I just kept unplugging it and plugging it in again and again after the the screen turned off while the white battery was showing it would charge some, boot and stay on charging correctly.
This is the first time this has happened....
Sent from my Nexus 7 using xda app-developers app
Sort of reading between the lines here, and I've only had my N7 for about a month now...
... but mine has never shown the battery display continuously when it is shut off but chanrging on the AC adapter. It comes on for a little while, and then shuts off - but the unit is still charging so far as I know.
Mine was sitting at 59% right now, so I shut it down, waited 30 seconds, and plugged it into the charger. The black and white screen shows up, changes once or twice, and the screen goes dark after about 13 seconds.
I don't take that to mean that it is not charging - it takes some juice to keep the screen lit, so the battery will charge faster if the screen is not lit.
I guess I usually leave it booted while charging, but I can certainly shut it off and verify that it is indeed charging without showing something on the display.
I think it is a bad idea to run your battery all the way down. Li-Polymer batteries do not exhibit memory from partial charging... but they DO have a safety circuit that disables charging if the battery voltage goes too low. You are not gaining anything by running it all the way down, but are risking the possibility that the safety circuit will flip and permanently prevent the battery from charging. (The low-voltage trip circuit is there to prevent chargers from attempting to charge a battery that has a short - that would be a fire hazard).
cheers
[ Edit ] I powered my N7 off at 50% battery, plugged it in & let it sit for 40min, and then booted it - charge now at 74%. The charging indication on the screen was only on for the first 15 sec. Dunno if you are saying something different - but I don't think the charging indication is supposed to stay continuously on while charging. Too bad the N7 doesn't have a small LED for this purpose.
bftb0 said:
Sort of reading between the lines here, and I've only had my N7 for about a month now...
... but mine has never shown the battery display continuously when it is shut off but chanrging on the AC adapter. It comes on for a little while, and then shuts off - but the unit is still charging so far as I know.
Mine was sitting at 59% right now, so I shut it down, waited 30 seconds, and plugged it into the charger. The black and white screen shows up, changes once or twice, and the screen goes dark after about 13 seconds.
I don't take that to mean that it is not charging - it takes some juice to keep the screen lit, so the battery will charge faster if the screen is not lit.
I guess I usually leave it booted while charging, but I can certainly shut it off and verify that it is indeed charging without showing something on the display.
I think it is a bad idea to run your battery all the way down. Li-Polymer batteries do not exhibit memory from partial charging... but they DO have a safety circuit that disables charging if the battery voltage goes too low. You are not gaining anything by running it all the way down, but are risking the possibility that the safety circuit will flip and permanently prevent the battery from charging. (The low-voltage trip circuit is there to prevent chargers from attempting to charge a battery that has a short - that would be a fire hazard).
cheers
Click to expand...
Click to collapse
Hm. I remember the screen always staying on when charging when powered off. But that could be just bad memory.
I still don't understand why it would power down after it booted up connected to my charger. (this is after leaving it plugged in for about 5 minutes turned off)
Sent from my EVO using xda app-developers app
All about charging Li-ion batteries. Li-ions are different than 'regular' batteries. Full changes and discharges is not the best for your battery.
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
Sent from my N7 using XDA Premium
Dirty AOKP 3.5 <&> m-kernel+ a35 (t11)
ezas said:
All about charging Li-ion batteries. Li-ions are different than 'regular' batteries. Full changes and discharges is not the best for your battery.
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
Sent from my N7 using XDA Premium
Dirty AOKP 3.5 <&> m-kernel+ a35 (t11)
Click to expand...
Click to collapse
pretty much all modern electronics don't allow a full charge or discharge.
Hi everyone,
My Photon Q was probably about 30% charge when I last checked with it on. An hour or 2 later it was a little warm and was off. So I went to charge it using the car charger with 500mah charge rate. I came back about an hour later and the phone was really hot and no charging screen so I unplugged it. The green led light is lit when the phone is plugged in.
I tried holding the power button and volume down button, but it won't boot. If I have the usb charging cable plugged in from a PC or charger adapter when pressing those buttons, the green light will flicker off for a fraction of a second.
I then proceeded to dismantling the phone as I suspect a battery issue and the one in this phone is stupidly non-removable. After taking the back cover off, I tested the battery posts and received 0 volts. I still don't know if the battery caused the drain or if there's a short in the phone. I then took off the inside cover that holds the battery in. A few T5 screws later and the battery was removed. I connected the battery to some AA batteries in series to see if I could get a charge. A few hours later I got it up to 3 volts which held for several hours. So I connected it to a few more AA batteries in series to try and raise the voltage. I got it up to 3.67 volts and the battery is listed at 3.7 volts.
A day later and the voltage is still at 3.67 volts so I put the battery in the phone. I went to try and power it on, but nothing. I then connected it to a usb cord and received the slow flashing red led light a couple times before switching to green. The battery started getting warm again connected to the usb charger. After 20 minutes it was approaching hot so I unplugged the USB. The battery read 3.54 volts. 30 minutes later, 0 volts again.
Does anyone know what the actual voltage range is for this phone, as my old Samsung M320 is also 3.7 volts, but when testing the battery I get 4.10 volts? I heard it's pretty specific on minimum voltage. Any ideas for a temporary battery or way to boot the phone before spending $50 on a replacement battery and then find out there's a short in the phone. Is there another key combination to boot the phone, I'm trying to boot it to at least get my pictures and other data off it.
Thanks a lot in advance
Matt
Not the battery, seems to be an electrical short but where
I bought a new battery for the phone which had a 0 volt charge when I received it. I tried putting it in the phone as is to use the phone charger to charge it, but got nothing. So I charged it using 2, then 3 and then 4 AA batteries in series to get it up to 3.7 volts. I then put the battery in the phone and noticed the 2 large chips and the chip centered above them located by the camera get a little hot. I tried with the charger connected and not connected, but same thing. Power button doesn't turn the phone on. Just the green led lit when the USB power cable is attached. So now it seems there must be a short in the phone. Anyone know where I can look to check for a short, blown resistor or something in this phone? Or at least where the rom chip is located so maybe I can turn it into a usb drive to get my data at the least.
And sorry about the double post. I didn't receive any replies in the other section and I really need to get some data off the phone. Seemed the hardware section would be the place to check. Tree fell on the house and pictures before the tree was removed were taken with the phone which of course ironically stopped working right after.