Is the Galaxy S(or android in general) capable of turning off charging? I would like to charge my phone from some unconventional sources(ie a solar panel or a bike dynamo), but that means the charging current can dip below useful rate. When that happens, the phone starts draining battery.
A more specific example: I bought a 5V solar panel with 700mA output. I hooked it up to a usb cable, shorted the data lines and the phone charges great. Except when the solar panel goes in the shadow, then the rate drops to 0, and when it comes out of the shadow it takes a long time to get the current back up if it's plugged into the phone. During that time the current slowly ramps up from 100mAh to 200mah to 300mah, until eventually it gets back up above 400mA and can actually charge the phone(instead of having the charging circuitry drain it).
What I would like to do is have the phone detect when the current dips below 400mA, then stop charging for 60seconds...try again..and stop if current still below a useful level.
I know I can get the current from /sys/devices/platform/jupiter-battery/power_supply/battery/batt_chg_current, can I use some proc file to also turn charging on/off? Is there an existing app that works for this?
Related
Any of you guys ever use the Google Navigation w/ N1, while plugged in to the car charger and find that it's still discharging even if it has the charging icon? Like the charging rate is less than the discharge rate.
I've used it in the car for hours, must be plugged in for me, otherwise it would be dead very soon. Mine gets hot as hell with the gps on while plugged in and driving looking at the screen.
I bet it's possible to achieve a negative rate of charge with enough stuff going on inside the phone.
I like it better than the tom tom though.
I have experienced this. I got to work and, despite having been on charge all the way there, my battery had depleted. 100% to around 85% on a 40 minute journey.
However my car cigarette lighter socket is extremely temperamental, and so it frequently looses connection. In the case of my N1 I was hoping this was the problem, rather than the phone. I can have the car repaired!
I have had phones in the past when it was possible to achieve a negative rate of charge (Samsung Omnia using internal GPS and HTC Wizard using bluethooth GPS). Particularly fun was the fact that the Wizard won't charge from a car charger when it gets too low. This left me STRANDED in the middle of the US.
Navigate uses alot of juice because of the GPS.
The phone can only charge so fast. If the usage is faster than the charging rate then obviously you'll get a slower charge or a depletion.
It's most likely your car charger. It is probably only pulling a small amount of power. There are some 1000ma car chargers you can buy that should work better.
I also believe the official car dock from Google will keep it charged too.
It definitely depends on the car charger and your settings.
My first car charger supplied 500mA (I had it lying around from some other piece of equipment I had bought). I did an experiment with the screen at 100%, navigating, and streaming Pandora. I lost something like 15% of the charge in 45 minutes or so.
I now have a 1000mA charger (just a couple of bucks at monoprice.com). What that same configuration, the battery goes down very, very slowly. If I don't run the screen at 100%, or if I turn off the screen during long stretches between turns on the highway, the Nexus One gains charge instead of losing it.
This may be of use: http://forum.xda-developers.com/showthread.php?t=669643
go plug your nexus into the car charger and go to settings, about, and see if it shows usb or ac and you will figure out the problem. it prob will say usb which means its only pulling 500 ma rather than the full 1000 ma that it should be. my car charger pulls the full amount and it can actually charge the device during navigation.
I have a simple Qi power mat that I use for charging my Nexus 4 overnight. It works quite well - a little too well in fact as it charges to full with about 6 hours left of the night. It then "disconnects" from the wireless charger and begins to discharge as if it were just sitting not on a charger.
If my backup is running or some other background tasks occur I end up with only 80% battery left in the morning which is annoying.
The way to restart charging is to remove it from the charger and place it down again - not something I can do while I am sleeping.
I was wondering if there would be a software way of 'resetting' the wireless charging so I could use something like tasker to fool the charger into thinking it had just been placed down again when, for example, the charge drops below 95%?
Would this be better in the Accessories or Developers forum?
I own a Galaxy S2. I have tried it using for navigation many times only to find that the battery discharges fully within 2 hours even if the phone is connected to a car charger. I used to think may be its because my car charger doesn't provide enough current to maintain the charge. But recently I found out the culprit. After around 20 minutes of use, the phone battery starts heating up, and it stops charging. I verified this with CPU-Z. It clearly shows battery overheated, power supply connected and not charging.
I was wondering if S4 also has similar issue. Has anybody used it for more than 2 hours with Google Navigation continuously while connected to car charger?
unni_kmr said:
I own a Galaxy S2. I have tried it using for navigation many times only to find that the battery discharges fully within 2 hours even if the phone is connected to a car charger. I used to think may be its because my car charger doesn't provide enough current to maintain the charge. But recently I found out the culprit. After around 20 minutes of use, the phone battery starts heating up, and it stops charging. I verified this with CPU-Z. It clearly shows battery overheated, power supply connected and not charging.
I was wondering if S4 also has similar issue. Has anybody used it for more than 2 hours with Google Navigation continuously while connected to car charger?
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Click to collapse
The most I have used it for is about an hour and half, and while the phone did heat up, it did continue to keep charging while connected to my in-car charger (just a cheap one). I can't remember whether the charger was able to keep up with the discharge though, I think it did. I was driving in bright sunlight, so I had screen brightness on max throughout that time.
.Astiak said:
The most I have used it for is about an hour and half, and while the phone did heat up, it did continue to keep charging while connected to my in-car charger (just a cheap one). I can't remember whether the charger was able to keep up with the discharge though, I think it did. I was driving in bright sunlight, so I had screen brightness on max throughout that time.
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Click to collapse
I've found that the USB cable can have a big impact on the charging current. I had the same problem with my car charger not keeping the phone charged, even though I was using a 2A charger. When I changed the USB cable I managed to quadruple the charging current (from 300ma to 1200ma) and solved the problem (I measured the charging current using the Galaxy Charging Current Lite app).
HTH
itm said:
I've found that the USB cable can have a big impact on the charging current. I had the same problem with my car charger not keeping the phone charged, even though I was using a 2A charger. When I changed the USB cable I managed to quadruple the charging current (from 300ma to 1200ma) and solved the problem (I measured the charging current using the Galaxy Charging Current Lite app).
HTH
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Click to collapse
In my case, I believe it was not because of the charging current or cable. I was trying with a car charger capable of charging a laptop, using the wall charger and cable which came with the phone. When the mobile stopped charging, I checked in CPU-Z app. The app was clearly showing status as "power supply connected, not charging and battery overheated". If I unplug the USB cable and connect it back, it will start charging again!
To make sure that I didn't miss anything, I will try with the app you suggested.
Just to update: The Galaxy Charging Current Lite doesn't seem to work with my Galaxy S2. It doesn't show any value.
hey guys i bought my niece a 2012 nexus 7 it has the axus charge with different usb cable but it charge so slow
i was wondering if there is a rom with better charging speed
i havent root and is wifi version
What does "so slow" mean? As in, how many minutes to change 10% in charge?
One thing you can do to troubleshoot things is to see how long it takes to charge the tablet when it is completely shut off. It should be pretty obvious that "the ROM" has absolutely nothing to do with that scenario. Wait till the tablet is discharged to about 10%, shut it off, and charge it for 90 minutes. If it is charging normally it will be close to 70% charge when you boot it back up.
If your tablet charges slowly in that case, then there is a problem with the charger, cable, or battery in the tablet - not the ROM. So, you should surely check that out first before you start worrying about software.
A nominal N7 (2012, WiFi) will charge from 5% to 100% in about 150 minutes: 2.5 hours. That's with a STOCK ROM. If you look at the battery capacity, that works out to a minimum 1.73A charging rate. (4.325 Amp-hours / 2.5 hours = 1.73 A). It's actually higher than that because a certain amount of charging current is "lost" to heat generation while charging.
The tab will ALWAYS charge slower than that if it is in use, especially if the screen is on and the owner is doing things like streaming data or playing games. If it is under heavy use, the tablet itself could easily dissipating 1.0 A of current... so in that case the 2.5 hour charging time would be over twice as long: over 5 hours.
The "fast charge" ROMs are not what you are thinking. "fast charge" there means "fast charge under conditions normally restricted to low currents when data transfer is taking place". If you are using a charge-only cable (such as the OEM charger and cable), the tablet should always be able to draw close to 2A of current with ANY ROM - there is no data connection present, and the tablet is not restricted in the current it can draw.
The ROMs don't really throttle the battery charging rate except in that very specific condition: when there is a data connection present. So, worrying about which ROM is installed really only applies to people that want to use a Y-cable and a live USB data connection (tethering or an OTG gadget attached) - for instance in car installs or maybe with data tethering via USB.
good luck
bftb0 said:
What does "so slow" mean? As in, how many minutes to change 10% in charge?
One thing you can do to troubleshoot things is to see how long it takes to charge the tablet when it is completely shut off. It should be pretty obvious that "the ROM" has absolutely nothing to do with that scenario. Wait till the tablet is discharged to about 10%, shut it off, and charge it for 90 minutes. If it is charging normally it will be close to 70% charge when you boot it back up.
If your tablet charges slowly in that case, then there is a problem with the charger, cable, or battery in the tablet - not the ROM. So, you should surely check that out first before you start worrying about software.
A nominal N7 (2012, WiFi) will charge from 5% to 100% in about 150 minutes: 2.5 hours. That's with a STOCK ROM. If you look at the battery capacity, that works out to a minimum 1.73A charging rate. (4.325 Amp-hours / 2.5 hours = 1.73 A). It's actually higher than that because a certain amount of charging current is "lost" to heat generation while charging.
The tab will ALWAYS charge slower than that if it is in use, especially if the screen is on and the owner is doing things like streaming data or playing games. If it is under heavy use, the tablet itself could easily dissipating 1.0 A of current... so in that case the 2.5 hour charging time would be over twice as long: over 5 hours.
The "fast charge" ROMs are not what you are thinking. "fast charge" there means "fast charge under conditions normally restricted to low currents when data transfer is taking place". If you are using a charge-only cable (such as the OEM charger and cable), the tablet should always be able to draw close to 2A of current with ANY ROM - there is no data connection present, and the tablet is not restricted in the current it can draw.
The ROMs don't really throttle the battery charging rate except in that very specific condition: when there is a data connection present. So, worrying about which ROM is installed really only applies to people that want to use a Y-cable and a live USB data connection (tethering or an OTG gadget attached) - for instance in car installs or maybe with data tethering via USB.
good luck
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Click to collapse
thanx man now i get it it won charge fast like the note 3
i was playing fifa 14 and didnt charge at all it was loosing power
mrej201 said:
hey guys i bought my niece a 2012 nexus 7 it has the axus charge with different usb cable but it charge so slow
i was wondering if there is a rom with better charging speed
i havent root and is wifi version
Click to expand...
Click to collapse
Get a better cable. I was using a third party cable on my Nexus 7 for a while and realized it was only charging about 10-15%/hr.. Changed the cable out for a better one and it charges at the normal rate now, 30%/hr or so.
Do check for loose connections for both battery connector and usb ribbon connector (under speakers). I’ve opened the back cover to check after slow charging problems and was solved by opening and clipping back the usb ribbon connector. Charging's back to normal now.
http://androidforums.com/nexus-7-20...esting-while-diagnosing-charging-trouble.html
Lim Wee Huat said:
Do check for loose connections for both battery connector and usb ribbon connector (under speakers). I’ve opened the back cover to check after slow charging problems and was solved by opening and clipping back the usb ribbon connector. Charging's back to normal now.
http://androidforums.com/nexus-7-20...esting-while-diagnosing-charging-trouble.html
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Click to collapse
thanx bro
I just purchased a generic Qi wireless charger receiver card and transmitter for the S5. I can't post the link because of new member rules.
The charger works well but when the battery reaches 100% full the phone stops charging. According to the Qi standard there is no provision or method for a 'trickle charge' used by all the traditional wall chargers (I can't post the link to this either because of new member rules). What Qi does instead is turn the charger on and off periodically to keep the battery at 100% - this process is supposed to be managed in the background operations of the phone.
With the S5 ever few seconds the screen turns on, a charger connected sound is played, and then the charger turns off and the screen turns off THIS REPEATS FOREVER. The phone gets quite hot and it's terribly annoying. This happens even if the phone is turned off. I'm not sure it even has anything to do with the trickle charge process - seems like its stuck in a loop. Qi transmitter detects a Qi enabled device and begins pumping power. Qi device produces 5.3v (or something similar), phone sees input voltage and turns on to notify user of charging, and charging stops almost immediately because the battery is full (repeat, repeat, repeat...).
Is there anything in the settings or using apps that would fix this problem? Does anyone know if the samsung brand S cover (charging cover) has some extra provision that prevents this annoying problem?
farmersride said:
I just purchased a generic Qi wireless charger receiver card and transmitter for the S5. I can't post the link because of new member rules.
The charger works well but when the battery reaches 100% full the phone stops charging. According to the Qi standard there is no provision or method for a 'trickle charge' used by all the traditional wall chargers (I can't post the link to this either because of new member rules). What Qi does instead is turn the charger on and off periodically to keep the battery at 100% - this process is supposed to be managed in the background operations of the phone.
With the S5 ever few seconds the screen turns on, a charger connected sound is played, and then the charger turns off and the screen turns off THIS REPEATS FOREVER. The phone gets quite hot and it's terribly annoying. This happens even if the phone is turned off. I'm not sure it even has anything to do with the trickle charge process - seems like its stuck in a loop. Qi transmitter detects a Qi enabled device and begins pumping power. Qi device produces 5.3v (or something similar), phone sees input voltage and turns on to notify user of charging, and charging stops almost immediately because the battery is full (repeat, repeat, repeat...).
Is there anything in the settings or using apps that would fix this problem? Does anyone know if the samsung brand S cover (charging cover) has some extra provision that prevents this annoying problem?
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Click to collapse
The real question is, why are you keeping it on the charger once it's 100% charged? At that point just remove it and continue about with your day