For questions specifically about issues with battery charging or power supply.

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4
votes
1answer
406 views

Why doesn't my device ever show 100% charged?

I have a Samsung Google Nexus S I9020A which showed fully charged @ 92%. 100% charging doesn't seem possible. What is the reason?
4
votes
1answer
708 views

The battery is discharged suddenly on Galaxy S2

Sometimes after I fully charge the phone, and disconnecting it from the power, the battery suddenly drops to 97%, it is normal? I already made a battery calibration past week. Well, this happened only ...
4
votes
1answer
272 views

Does my Android phone uses battery or outlet power to operate while being charged?

I am curious about knowing which power source does my android uses up, while it is being charged while switched on.. I know i can test it by keeping it in charging and pulling the battery.. but i am ...
4
votes
1answer
4k views

Looking for a consistent answer about battery calibration

This forum is full of questions about battery calibration. The thing is, that either I'm blind or one answers contradicts others. In particular: For example forums says, that battery should be ...
4
votes
1answer
261 views

Can a cheap cable prevent AC charging from working?

A while ago, I had my phone repaired (the USB socket was worn out) and had to replace the USB cable as well. Since then I haven't been able to quickly charge my phone in AC mode. Previously it worked ...
4
votes
1answer
1k views

USB charging in host mode [duplicate]

Possible Duplicate: Using an OTG cable while charging Recent versions of Android allow USB to operate in host mode. But is it possible for them to be powered/charged via that same USB port ...
4
votes
4answers
762 views

SD card unmounted when HTC Desire is being charged (even with a “wall charger”)

Whenever I plug in the charger into my HTC Desire (2.2) it unmounts the SD card. I can get around it when it's connected to a PC or other device via USB by selecting Charge Only again in the charge ...
4
votes
1answer
7k views

How do I turn on the battery full notification sound?

Similar to this previous question, but I want to enable the battery full notification sound, not the opposite :) My Galaxy S used to make a nice beep and switch the screen on briefly when the battery ...
4
votes
0answers
433 views

500 charge limit on wireless charger for Nexus 4 / 5 (QI)

I recently bought a QI compatible charger for my Nexus 5. On the box it states, that the "wireless charges up to 500 times". I don't understand why the charger is only able to charge my phone 500 ...
4
votes
0answers
315 views

Verizon Galaxy Nexus Discharging When Plugged In Even After USB Replacement

I've got a Verizon Samsung Galaxy Nexus that as of a few weeks ago quit charging - in fact it quickly drains the battery (discharges 2% / minute if not more) while plugged in. I tried different ...
4
votes
0answers
162 views

Phone thinks it is charging when not plugged in [closed]

Quite often my phone lights up the charging symbol even if the phone isn't charging. It applies when it's of and on. The behaviour seems somewhat glitchy, it turns on and off. Is this a well known ...
4
votes
4answers
6k views

my battery charge indicator is continually flashing on and off

My battery charge indicator (the screen info saying % full), flashes on/off/on/off, etc. sometimes. I've switched the battery to a spare to see if that helps but it didn't. When it does happen, ...
3
votes
8answers
13k views

Charging the Asus Transformer (Prime)

Can you charge the Asus Transformer (or the newer Prime) without the keyboard dock? Since the tablet itself does not have any USB ports, I don't see how you could charge the tablet without the dock ...
3
votes
3answers
13k views

Can my Samsung Galaxy Nexus and iPhone 5 share same micro USB charger?

Does the micro USB charger cable that comes with the Samsung Galaxy Nexus be used with the iPhone 5 and vice versa?
3
votes
2answers
2k views

Why does my phone have erroneous input when connected to a non-OEM power source?

My phone (Motorola DROID RAZR MAXX) seems to have problems accepting touch input when connected to a non-OEM power source. When connected to my computer via USB, it accepts input fine, as it does when ...
3
votes
1answer
368 views

USB charger produces high-pitched noise while charge is at 100%

I recently bought the European version of the PowerCube, which combines three power outlets with two USB chargers. I noticed that as soon as my smartphone charge is at 100%, it starts producing a ...
3
votes
2answers
3k views

Can you charge a Galaxy Tab 2 7" with a charger from Galaxy Tab 10.1?

I've already got a charger for the Galaxy Tab 10.1 and I'd like to be able to use it charge both that and a Samsung Galaxy Tab 2 7". It seems to work, but I was wondering if there is any sort of ...
3
votes
2answers
197 views

My phone doesn't always charge at full speed, even with certain 2-amp chargers. What are the necessary conditions for it to charge at full speed?

I've noticed that my S4 doesn't always charge at its maximum rate of charge, even when it seemingly should. For example, car DC adapters that claim to provide up to 2.0 amp current only provide ...
3
votes
1answer
5k views

Samsung Galaxy Ace wont charge

Hello my wife has the galaxy ace gt s5830 but for some reason it wont charge either off the original charger, or blackberry charger, neither off the usb in the laptop will it charge, if i take the ...
3
votes
1answer
5k views

Micro USB cables that only charge but no data, no mounting etc (Samsung Galaxy S)

Not all cables seem to be created equal but I've never got to the bottom of why so many (cheap) cables I try only charge - no data. Anyone know why? Certain pins not connecting? I do know that longer ...
3
votes
2answers
1k views

galaxy s3 not charging

I have a samsung galaxy s3. It is only 7 months old. Its battery is not getting charged. I have tried to reboot and take the battery out and put it again,it still doesnt get charged. The usb port is ...
3
votes
1answer
52 views

MOTO E not turning on after upgrade

Run the update on my moto e yesterday, and after installation, it shut itself off an couldnt turn it on again. I got 1 or 2 blink led while pressing power for 10 seconds (this only if it is plugged), ...
3
votes
2answers
100 views

Does a phone's battery charge when in download mode?

I bricked my SM-J500G when trying to root the phone. Now I'm trying to install the stock ROM. The problem is that my phone's battery is low, and I have no way to charge it in another phone. Can I put ...
3
votes
1answer
141 views

How to determine maximum capacity of a battery in mAh? - received fake battery

Is it an increasable value ? I think its not. I just bought an extended 3890 mAh battery for my Galaxy S4 GT I9500. The original Samsung battery is 2600 mAh. This is my second purchase from a ...
3
votes
2answers
46k views

Does charging a phone with another phone's charger affect it in any way? [duplicate]

I have a Samsung S4 and because its charger is short I charge it with a Samsung Wonder charger. I am afraid that it can damage the battery or something. Will it?
3
votes
1answer
2k views

Nexus 5 touch response is slow while charging

My problem is simple. Touch response of my Nexus 5 is very slow while charging. I can't even unlock the pattern while charging. I need to draw it very slowly. My OS is Android 4.4.2. I have been ...
3
votes
5answers
18k views

Slow Charging Battery!

I have a Samsung galaxyS3 the battery has been charging really slow. It can take up yo 10 hours to charge 100%. I have tried every thing I can think of. I've tried a new charger, new battery, shut ...
3
votes
2answers
183 views

My Nexus 7 is dead, any suggestion?

My Nexus 7 died. I didn't see it happening. My son was playing, went to school and left it charging. At night it didn't turn on anymore. The screen is black. I've followed the Asus instructions. This ...
3
votes
1answer
811 views

Get charge state remotely

I want my desktop to check state of the phone and warn me at appropriate time (calculated on my presence at the desktop, phone charge, time of day and other criteria). Is there a way to get my phone ...
3
votes
3answers
432 views

How can I prevent the battery in my Nexus S from draining overnight?

I have a Google Nexus S and for the past 2-3 days whenever I go to sleep the battery drains completely overnight. I mean when I go to bed the charge on my phone is plus 90% but for the past 2 days ...
3
votes
0answers
44 views

How to boot my Samsung Galaxy S4 mini when wall charger is plugged

I am Developing an Android Application, here i want my phone to start booting automatically when the phone is plugged into any power outlet without hitting any power button.I found many solutions and ...
3
votes
0answers
184 views

Use “Lock Screen” as Daydream option

maybe its too simple a question, but I need to figure out how I can just use my lock-screen as daydream option for an android lollipop device. What I want is to see the normal lock screen while ...
3
votes
1answer
127 views

Computing when on charger - long term effects on battery life

Donating your computational power for scientific projects is, in some cases, available for Android. One of them, the World Community Grid, states that "Using the application will not significantly ...
3
votes
0answers
240 views

Large difference in battery discharge, when Nexus 7 is on and off

My father got a brand new Google Nexus 7 II (2013) LTE tablet few weeks ago. Ever since first use, he was complying about battery discharge rate. Few days ago, I did some measures and I'm quite ...
3
votes
4answers
8k views

Galaxy S3 is stuck at Samsung logo splash screen and won’t charge

A little bit of help would be highly appreciated. A few days ago, my Samsung Galaxy S3 started freezing randomly. I had to remove the battery in order to restart it. Yesterday the problem got worse: ...
3
votes
0answers
584 views

Android stuck in downloading mode

So what happened is that my mobile (Galaxy S4 - GT-9500) ran out of charge. When I plugged in the charger and tried to turn it on, it went directly to what I think is the recovery mode (Android logo ...
3
votes
2answers
409 views

Nexus S and phone charger get unusually hot when plugged in

I was using my Nexus S today and it turned off suddenly. I plugged it in to charge and saw it load to the boot splash screen, and then I went to sleep. When I woke up 2 hours later my phone was dead. ...
3
votes
0answers
339 views

since upgrading my software to 4.1 my samsung galaxy note wont charge properly

I recently upgraded the software on my galaxy note to 4.1 and since then its been very strange when charging. I put it on charge last night woke up this morning it said charging 23% came back to it a ...
3
votes
0answers
576 views

Nexus7 Stuck in Reboot Following Full Discharge [duplicate]

I am experiencing the same symptoms as described in the following: " Nexus 7 is stuck in reboot loop after full discharge " My Nexus 7 is full discharged. I have it connected to Factory AC-to-USB ...
3
votes
1answer
465 views

How do I keep CPU off when charging?

When I connect the USB power source, it makes CPU to stay on (even though "Development->Stay awake" is off). When charging from a weak power source if makes battery to drain even faster than is case ...
3
votes
0answers
501 views

My phone crashes while charging

My phone sometimes shuts down without a reason or warning. It often happens while it's charging. I'm not positive charging is an absolute requirement for this to happen, but I only remember it ...
3
votes
2answers
592 views

Samsung GT 7.7 hung after charging

After charging my Samsung GT 7.7, I switched it on but it just showed the "Samsung Galaxy Tab 7.7" and stayed like that like it hung. What do I do?
3
votes
1answer
522 views

VZW Galaxy Nexus exhibiting bizarre charging behavior

Lately I've noticed some weird behavior with my Galaxy Nexus. I am rooted, but running stock ICS. Here is what it's doing wrong: Phone sometimes will not charge, I must turn it off for it to start ...
3
votes
0answers
634 views

Battery life in Samsung Galaxy 3

I recently updated my Samsung Galaxy 3 to Android 2.2 . After the update my fully charged battery dies in just 3 hours(without any use) and around 1 hour if I use it (talking,browsing etc). I am using ...
2
votes
3answers
13k views

Can USB charging (via mains adapter or from PC/Mac) of Android tablets be the main, primary method of charging? Or are there design issues?

Are there design issues with tablets being charged by USB not seen with Android phones? I saw this on another forum, what are your thoughts on this with regard to my question? ...
2
votes
5answers
32k views

MTP mode instead of charging with plugged in wall charger

My Galaxy Tab P1000 was charging when it fell down. I tried plugging it in again to continue charging but the battery icon now appears with a cross mark and instead the MTP mode initializes. How can ...
2
votes
3answers
4k views

How long device has been running since last charge?

In Android Lollipop, how do I see how long it has been since the last time I charged the battery? I mean I can get the approximate time by eye-balling the graph shown in Settings -> Battery. But, is ...
2
votes
2answers
1k views

Will using my phone whilst charging make it charge slower?

Just the question in the title. If I have my phone plugged in and charging, will it take any longer to get up to 100% charge if I'm using it or will this make no difference? (I'm using a galaxy ...
2
votes
2answers
4k views

How can I make my Lenovo ThinkPad tablet charge up faster?

It takes a very long time (half a day) to charge up with a USB 2.0 charger plugged in the wall outlet.
2
votes
3answers
79 views

Charge and USB keyboard through 1 USB port

I have a Samsung Tab E that only has one USB port. Can I charge the tablet and have a USB keyboard attached at the same time? I've tried a 3-way cable ( link to Amazon ) but it supplies power to the ...