I'm not sure if this has been noted elsewhere but I couldn't find it if it was.
I ran into the problem yesterday in which my HD2 running WP7 would drain the battery if connected to the PC USB port instead of charging it. This was the first time my phone had done this and restarting the phone and switching USB ports did not result in any difference.
On a whim I decided to look in my device manager and there was an unknown device listed there. I selected it and had is search for and install the drivers and now it listed as USB Composite Device. Once that was done, the phone charged as normal.
jaxjaguar said:
I'm not sure if this has been noted elsewhere but I couldn't find it if it was.
I ran into the problem yesterday in which my HD2 running WP7 would drain the battery if connected to the PC USB port instead of charging it. This was the first time my phone had done this and restarting the phone and switching USB ports did not result in any difference.
On a whim I decided to look in my device manager and there was an unknown device listed there. I selected it and had is search for and install the drivers and now it listed as USB Composite Device. Once that was done, the phone charged as normal.
Click to expand...
Click to collapse
My phone's listed as Windows Phone USB, which i think is cool, but stll not enough!
Charging takes hours...
stealth21 said:
My phone's listed as Windows Phone USB, which i think is cool, but stll not enough!
Charging takes hours...
Click to expand...
Click to collapse
that depends on the charging source.
if you use a laptop you will only be getting 200-300mA of current, a normal PC USB port will give you around 500mA, the wall charger will give you 1A (1000mA)
Now its not as simple as that as the device uses some of that power for working as we cant charge whilst off, so knock 100mA off it if the screen is on, on standby it'll be minimal so forget that.
1A charger should get you charged in ~1.5 hours
PC will double it to ~2.5 hours, some PCs do have 1000mA ports so say ~1.5-2.5 hours)
laptop could be ~4-6 hours (some laptops do have 500mA ports so say ~2.5-6 hours)
note you can get 2A quick chargers (~35min-45min, but i would be very careful with those an can ultimately lead to a shorter life span of the battery
dazza9075 said:
that depends on the charging source.
if you use a laptop you will only be getting 200-300mA of current, a normal PC USB port will give you around 500mA, the wall charger will give you 1A (1000mA)
Now its not as simple as that as the device uses some of that power for working as we cant charge whilst off, so knock 100mA off it if the screen is on, on standby it'll be minimal so forget that.
1A charger should get you charged in ~1.5 hours
PC will double it to ~2.5 hours, some PCs do have 1000mA ports so say ~1.5-2.5 hours)
laptop could be ~4-6 hours (some laptops do have 500mA ports so say ~2.5-6 hours)
note you can get 2A quick chargers (~35min-45min, but i would be very careful with those an can ultimately lead to a shorter life span of the battery
Click to expand...
Click to collapse
Thanks for quick reply, i tried computer it took so long..
Although I'm using wall charger nowadays it takes more then 3-4 hours. Theres something wrong, When i had winmo6.5 the device was fully charged in 2.5 hours...
stealth21 said:
Thanks for quick reply, i tried computer it took so long..
Although I'm using wall charger nowadays it takes more then 3-4 hours. Theres something wrong, When i had winmo6.5 the device was fully charged in 2.5 hours...
Click to expand...
Click to collapse
yeah that doesnt sound right, the battery its self is only 1230mA, the wall charger is 1000mA on standby within WP it should draw any more than 10mA but lets say 100mA on the extreme side, that gives you a net gain of 900mA every hour which is like 1 hour 20min.
I assume its the 1A charger that came with the device? check the adaptor and see what the current output is listed as
according to your figure of 3 hour charge time ( again, assuming from flat) that means its dumping around 400mA in to the battery an hour. That means one of two things
Firstly that your device is using an incredible 600mAh, that would be toasty and is unlikely!
Secondly, the charger isnt putting out 1000mA, more likely 500mA or 300mA
I suppose there is a third option, something gone wrong in the device its self, i cant think why it would tho, try running it near flat, restart it, make a note of the battery level then restarting again (you restart twice because WP on the HD2 has battery reporting issues) hold down the VOL down button on reboot which will take you in to the bootloader.
plug in the charger and leave for half hour, go back to windows and look at battery (remember to set the clock properly again!)
if the charger is 500mA it will have only charged to just less than 1/3
if its 1A it will be just less than 2/3 maybe half
the point of doing it in the bootloader is that you rule out WP and its dodgy drivers and will help to narrow down the problem
Check charge current in Battery tool apps. Battery current - positive figures are charging current.negative discharge.
To get high charging current(more than 200 ma) from power suply(wall or car) usb data lines must be shorted(fast charging mode). On ploperly made power supplies usb data shorted and phone can suck high current(700-800ma normaly not more).
Even if on charger written 1000ma it doesn't mean phone wil take all. what is written on charger - it is max allowed.
zcdg said:
Check charge current in Battery tool apps. Battery current - positive figures are charging current.negative discharge.
To get high charging current(more than 200 ma) from power suply(wall or car) usb data lines must be shorted(fast charging mode). On ploperly made power supplies usb data shorted and phone can suck high current(700-800ma normaly not more).
Even if on charger written 1000ma it doesn't mean phone wil take all. what is written on charger - it is max allowed.
Click to expand...
Click to collapse
Indeed, although from my own tests it draws around 900mA, there is a large number of variables including power fluctuations on a dirty line regulated supplies, state of the battery, etc, its safe to play with estimates I think in this case without overcomplicating things, but the fact remains, on a wall charger that comes with the HD2 it should fully charge in around 1.5 hours unless it is not the same charger or something is wrong with it.
dazza9075 said:
Indeed, although from my own tests it draws around 900mA, there is a large number of variables including power fluctuations on a dirty line regulated supplies, state of the battery, etc, its safe to play with estimates I think in this case without overcomplicating things, but the fact remains, on a wall charger that comes with the HD2 it should fully charge in around 1.5 hours unless it is not the same charger or something is wrong with it.
Click to expand...
Click to collapse
yes, with correct wall or car charger it charges in about 1.5 hours from almost empty to full.
Related
Today I had pluged my usb cable in my cell and when I unplug the cable my battery was 30% charged but as soon I unplug the usb cable i got battery low warning and suddenly my cell shutdown. When I start the cell it shows -1% battery and now if I chrage the battery from charger it wont showing charging (animated charging bar) but its actualy charging it very slowly but now if I again plug usb cable and unplug it the cell again shutdown instantly.
I have tried different pcs and cable but the problem still there. Should I hard reset it? I dont install new software or change any settings durring the day.
If there isn't any important data on the phone,yes , you can try the Hard reset,but most probably the cause for not charging, is something else and not the rom (OS),so Hard reseting will not boost up the charging.If the device is not charging ,its rather more of a Hardware issue than a Software. Try to charge with a Wall charger (Mains),if it charges normally,then the fault lies in the usb cable,it might be faulty or try with other usb input port on the pc,but if it still doesn't charge with the Wall charger,than most probably the mini usb port of the phone is faulty or damaged or it might be that the battery is giving upon you.Confirm and check all these options.
I have already tried the external (home) charger and different usb cable and pc.
I cant hardreset as the battery is lower then 50% charged.
Just for your knowledge that the active sync is working fine and ithink mini usb port is not totaly dead,
And the orange light on top is keep blinking when I have plugeed usb cable.
And battery status show +21mA and +68mW only. What it should be?
BTW battery status icon bar keep animating while I have pluged usb cable. does it mean its charging.
Also let you know that this morning my battery last to below 10% charged and after that the problem starts.
And after pluging usb cable for few minutes if i do softreset then after reboot the system shows few % battery charged ( around 10%) but its drains very fast (in 2-5 minutes).
azfar said:
BTW battery status icon bar keep animating while I have pluged usb cable. does it mean its charging.
Also let you know that this morning my battery last to below 10% charged and after that the problem starts.
And after pluging usb cable for few minutes if i do softreset then after reboot the system shows few % battery charged ( around 10%) but its drains very fast (in 2-5 minutes).
Click to expand...
Click to collapse
Ah !
So it has gone below the retention charge, required to start the charging circuit ,thats why its not charging.
Now either try to charge with a wall charger capable of out put of 1.0 amp or you need to 'Jump' start the battery.
i dont understand can you explain it a bit more.
This it what he's trying to say:
The battery has a well-documented bug. If you drain it below a certain amount (around 5% IIRC) then it can ONLY be charged from a wall charger, regardless what else the phone says or does. Your symptoms are weirder than usual, but not too surprising.
Replacement batteries are cheap and readily available. Start shopping for a new one while you leave the phone on the wall charger for at least 6 hours, with the phone OFF. This is a last-ditch attempt to recover your battery. If it still misbehaves after that, it's probably toast.
Thanks for explanation.
does the usb cable hack work (connect the red and black cables to battery + and -)?
azfar said:
Thanks for explanation.
does the usb cable hack work (connect the red and black cables to battery + and -)?
Click to expand...
Click to collapse
YUP !
Thats what is 'Jump' start.If the battery is only below the retention charge,it can be very easily recouped by this trick.If it works fine,otherwise get a new battery,many have recovered their batteries by Jump start.
Check out this link :-
http://forum.xda-developers.com/showthread.php?t=374108
thanks for the link.
OK jump start do the trick (charged the battery) but my phone is still draining the battery very quickly (around 1% a minute) and I havent check the home charger or usb cable charging.
azfar said:
OK jump start do the trick (charged the battery) but my phone is still draining the battery very quickly (around 1% a minute) and I havent check the home charger or usb cable charging.
Click to expand...
Click to collapse
ok,good if it has started to charge,now don't ever let it fall below atleast 30%,how did you charged it if not through home charger or usb cable,get the battery fully cgarged with home mains charger and then check the drainage of the battery.
Secondly,either the battery cells have gone weak and not retaining the charge for long or you are using GPRS more often,coz it drains the battery quite rapidly.it all depends on your usage.
I just charged the battery from naked usb cable and it charged it but the battery drainage problem still presist and if I charge the battery from usb or charger the os dosent shows it charging. I think i should look for new battery.
Can you explain me what kind of battery should i choose for wizard as here too many local batteries are available and I dont know about correct specs for battery like mah, mwh, volt, etc and kindly also let me know I also doubt on my home charger what kind of charger should I get (mah, mwh, volt, amp)?
BTW I dont fully charge (100%) the battery yet, do i still need a one full charge and I also dont shock the battery by 1amp charger aswell.
azfar said:
I just charged the battery from naked usb cable and it charged it but the battery drainage problem still presist and if I charge the battery from usb or charger the os dosent shows it charging. I think i should look for new battery.
Can you explain me what kind of battery should i choose for wizard as here too many local batteries are available and I dont know about correct specs for battery like mah, mwh, volt, etc and kindly also let me know I also doubt on my home charger what kind of charger should I get (mah, mwh, volt, amp)?
BTW I dont fully charge (100%) the battery yet, do i still need a one full charge and I also dont shock the battery by 1amp charger aswell.
Click to expand...
Click to collapse
Yes ! you must first fully charge the battery and than check the drainage.
Secondly I can't recommend any specific battery,check the specifications on the battery and verify it.
If the home charger is doubtful,you shud get an original PDA phone charger capable of 1.00 amp out put.
ok I also don't able to installnew rom on it, its giving me erorr that phone is not connected to usb cable etc.
Now the active sync is not bieng connecting too and I think now my mini usb port is faulty is it repairable?
azfar said:
Now the active sync is not bieng connecting too and I think now my mini usb port is faulty is it repairable?
Click to expand...
Click to collapse
Yes it is repairable or replaceable for that you'll have to contact the cellular company from whom you bought the phone,if its still under warranty. Otherwise get it repaired from any mobile repair shop.
ok may I know from where you belong?
azfar said:
ok may I know from where you belong?
Click to expand...
Click to collapse
Don't you see my country flag on my posts and my city of residence is also mentioned there
hmm I see.
Hrm.. This is interesting.. I used to always charge my G1 with AC power. However past couple days, I was lazy and used my laptop USB to charge it. I noticed those days however the battery life was HORRIBLE! I mean I couldnt even get past lets say 9 hours without the battery being at 15-30% and this is without doing anything major. On AC I always got home with 50%.
Has anyone else noticed this? I am using the power profiler mode, so unless something goes out of whack on USB power mode, which I dont see why it would...
(Also I did turn off phone and back on to reset anything just in case) but its just a interesting thing that it seems USB charges suck?
Yes I noticed the same thing, used the computer USB to charge and only lasted about 6 hours of the day. I use the Wall charger and get about 9 hours consistantly. Not sure why but I have noticed this several times........
Mark
Every Tmobile rep I've talked to always say the AC charger does a better job of charging the phone.
Hrm, is this info on a G1 Wiki yet? Would be good info to pass around. My logicial guess is that USB charging can only allow the voltage on the battery to charge to "x" max. While AC power being stronger could bring the battery up more. I cant say thats fully the case.. but since the USB cannot supply the power max a AC could.. its possible.
I've got and idea for a little test, would be helpful to see a lot of different users results as well..
Get Battery Graph, run your phone dead, plug in usb charger and graph. then take a screenshot of the overall charge time, clear graph
Run it dead again, plug in AC charger #1 and and repeat
Repeat the process for each additional recharging apparatus
The reason I mention additional apparatuses is because I think my car's DC charger does better than both ac and usb (tho this will be hard to get a full accurate graph of) , also I use my gf's moto charger from time to time (i know bad mojo)..
This will probably take a few days as charging will take place at sleep time for me but this should give us an over all view of how things are working if we all get pretty consistent results..
Mysticales said:
Hrm.. This is interesting.. I used to always charge my G1 with AC power. However past couple days, I was lazy and used my laptop USB to charge it. I noticed those days however the battery life was HORRIBLE! I mean I couldnt even get past lets say 9 hours without the battery being at 15-30% and this is without doing anything major. On AC I always got home with 50%.
Has anyone else noticed this? I am using the power profiler mode, so unless something goes out of whack on USB power mode, which I dont see why it would...
(Also I did turn off phone and back on to reset anything just in case) but its just a interesting thing that it seems USB charges suck?
Click to expand...
Click to collapse
I've had 4 different miniUSB charging phones and all of them have had this same behavior. I'm sure that the voltage coming through the USB isn't as strong as AC.
I have the same issue too...!!!
No offense.. but EVERY phone charges better w/AC versus USB .. This is not just a G1 issue .... lol
jamaicansolja said:
No offense.. but EVERY phone charges better w/AC versus USB .. This is not just a G1 issue .... lol
Click to expand...
Click to collapse
Indeed.
Also, USB charges at 500 mAh, while the AC gives double if i remember correctly.
jamaicansolja said:
No offense.. but EVERY phone charges better w/AC versus USB .. This is not just a G1 issue .... lol
Click to expand...
Click to collapse
Im wondering, if I use my usb while plugged into my laptop (for tether wifi app) will this hamper my battery life? I have the extended battery (2200mah) and I get far better life from it and to be honest I like the bigger size because the g1 felt too much like a toy to me before.
What do you guys think will this mess it up? I dont have wifi at home so the tetherwifi app is the only way I have net on my laptop unless I go somewhere where they have wifi. Cursed neighrbors and there password protected networks!
Might using a USB stepup voltage converter help? I've used it to charge my Nokia phone on usb in the past so it would reach the battery is full message.
The argument is usually that laptop usb don't output adequate voltage.
Its cheap and works for me on the nokia phone, Haven't tried it on the G1 yet though, can anyone find the ac charger's output info?
http://www.dealextreme.com/details.dx/sku.2649
yea this goes for alot of devices.. my ipod/psp charge pretty slow compared to wall outlet, however i didnt really see strength difference.. never tried USB charging my g1
I think it's worth noting I have the G1, My girlfriend has a HTC Touch(Elfin)
Both use Mini-USB Charging, both have 5V 1A Batteries (can't remember mA rating though)
Through a wall charger, my phone seems to charge quicker, but I get no longer out of it, the same behaviour is exhibited with the Touch. Both USB and the Wall charger are rated at 5V (It would/coul destroy componants methinks if it was any higher).
USB's Specifications say that unless a device has special permissions, It can only draw 500mA, with a maximum of 1000mA and a very rare (as in, one maybe two things use it) 2000mA.
Also, I have a custom made USB charger, that takes 3 AAA batteries (1.5x3 = 4.5)
It causes the phones internal battery to mess up, but does actually charge it (just a lot longer than other methods). It's more of an extended battery however, as it says it is charging, yet the battery life slowly degrades.
It's simple really and it has already been explained.
The USB port on a computer is limited to 500mA for most devices where as AC chargers like
The G1's can rpovide up to 1 Amp, even more/less depending on the chargers.
It doesn't depend on the voltage but on the current delivered. Less current equals
More time to charge and viceversa,
There is no myth.
I can't remember if this has been happening before, but when I have the HD2 conncted to a computer it takes forever to charge. Maybe 1 % per 10 or 15 minutes! Charging on the regular charger is so many times faster. Mybe 1 % per minute or so. This can't be right, can it? I have the same problem on my HD2 and my wife's HD2. They both are using the same ROM (ironically it's the Energy Max Sense ROM...). Is it possible that the ROm is the culprit? They both have quite new original batteries.
USB port supplies less than half the "oomph" of the wall charger. USB charging will run about 300mAh while wall charger will supply about 800mAh
Also, older PC power supplies and older USB 1 sockets may provide even less, depending on what other devices are in/on your machine drawing power.
Yes, thanks. I know that. But that shouldn't accord for an at least 10 time slower charge. And I know that they weren't like this before, but I can't remember how long before. And I have no idea if it can be the radio ROM, the regular ROM or what.
I use energy ROM but older 23699 & see no issues on USB charge rate but yours does seem rather long, what status is the device in when USB connected & is screen off !
Also, keep in mind that the rate of charging goes down as the battery level approaches 100%. So maybe u r comparing charging rates measured over different regions of the curve, i.e. observing the rate with usb charging when the battery is around 90% will be drastically different from the reading observed with wall charging when the battery is at 10%.
Sent from my HD2
Mastiff said:
I can't remember if this has been happening before, but when I have the HD2 conncted to a computer it takes forever to charge. Maybe 1 % per 10 or 15 minutes! Charging on the regular charger is so many times faster. Mybe 1 % per minute or so. This can't be right, can it? I have the same problem on my HD2 and my wife's HD2. They both are using the same ROM (ironically it's the Energy Max Sense ROM...). Is it possible that the ROm is the culprit? They both have quite new original batteries.
Click to expand...
Click to collapse
if youre running windows 6.5 the quickest way is to turn the phone off then charge
or get a cheap chinese battery charger 6 dollars and a spare chinese battery extended around 10 bucks with 2400 mah double the juice i got a couple of those i never charge my phone anymore lol
Mister B, I have tried with the phone both on and off. But I really need to keep the phone on because I get a lot of work mail and SMS that I need to keep an eye on. Also I don't think I had problems with earlier versions of Energy, I may have to try to go back and see if it's the ROM.
ASCIIker, no. The problem isn't the final bit of the charge. If I put it in when it's around 30 % it almost won't charge at all. If anything it looks like the phone is getting a better charge when it's close to 100 %.
Casemandan, I have a charger like that you describe, but I do a lot of driving with TomTom, and even though I did change battery on the run yesterday it's not something I would recommend...
Btw I have the same problem in the car, with a combined charger/battery charger cradle that I have put there. The red/orange charging light is on, but it goes slowly down instead of charging. But I'm wondering if that is because the car charger is connected to a mini USB in the cradle, not to the micro USB. I have to try that.
I don't have mine connected for much time via USB to PC but when do & have left on charge rate seems acceptable, could be ROM as I found a few issues with newer builds.
As for car charger the low rate will be down to the power adaptor unit being recognised as USB charge not AC charge.
If the Power adaptor you are using can feed 800mA<>1000mA then modding it by bridging data leads so handset goes to AC charging rate is the way forward. Use tbattery to see what current charge mode is.
You may be able to buy car charger already set for AC charge (have a browse in HD2 accessories forum) but I use an old USB 1000mA Ericsson adaptor I bridged for AC charge mode.
Like you say testing charge direct in car is a good idea as many of the phone/battery charger cradles output pathetic charge current.
Well, it's not the ROM. I tried an original ROM and had the same problems. I need to see if there is something wrong with my cradle. I do have a charger that should do what you describe, but when it's plugged into the cradle in the car it doesn't. I'll try to connect it to the micro USB instead of the mini USB and see if that matters.
Hi. When i charge my phone from any USB from my computer... It charges so slow.. It even discharges sometimes.. Loses 2% and so on... And slowly climb... To fully charge it from USB.. It takes almost 4-6 hours... I don't know how i can fix that... OR if there is any way to fix it...
MrFuZZy92 said:
Hi. When i charge my phone from any USB from my computer... It charges so slow.. It even discharges sometimes.. Loses 2% and so on... And slowly climb... To fully charge it from USB.. It takes almost 4-6 hours... I don't know how i can fix that... OR if there is any way to fix it...
Click to expand...
Click to collapse
Install an app like Galaxy Charging Current Lite to check the amperage of the cable when it's charging through usb. You should be getting 460 mA. If you plug the wall charger in you should be getting 1200 mA (or 1900 if you have a modified kernel).
If you are not getting these values change the USB cable.
Fully charging the phone through USB takes longer no matter what, and 4-6 hours sounds about right to me. If you are using your phone as you're charging through the computer (like browsing heavily or playing a game), it might discharge rather than charge due to the application drawing too much power.
kingzain900 said:
Install an app like Galaxy Charging Current Lite to check the amperage of the cable when it's charging through usb. You should be getting 460 mA. If you plug the wall charger in you should be getting 1200 mA (or 1900 if you have a modified kernel).
If you are not getting these values change the USB cable.
Fully charging the phone through USB takes longer no matter what, and 4-6 hours sounds about right to me. If you are using your phone as you're charging through the computer (like browsing heavily or playing a game), it might discharge rather than charge due to the application drawing too much power.
Click to expand...
Click to collapse
Thanks for that reply.. I'm getting 460.. But before I'm pretty sure i charged faster.... I guess some motherboards can push more power to the USB port....
MrFuZZy92 said:
Thanks for that reply.. I'm getting 460.. But before I'm pretty sure i charged faster.... I guess some motherboards can push more power to the USB port....
Click to expand...
Click to collapse
I think that the Samsung Kernel also limits the current drawn through USB ports even if you can send more current to it.
Connecting and charging from computer is very slow, unless you have a utility for your motherboard, like me, i have Asus AI+ charge. It allows usb ports to provide more power.
If you don't have some kind of a utility like this, your best way is to charge via wall charger. It gives 1900mAH with stock kernel, just if you check with some app at what amperage its charging, it will show 1200mAH cause it charges 1900mAH only if the phone is locked dunno why, maybe overheating issue.
It takes about 2hours for me to charge from 5% to 100% with wall charger.
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
Click to expand...
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
Click to expand...
Click to collapse
thanx bro