Database Develop

[Q] USB Charging?

Just got a Tab but I bought it off of someone who couldn't find there charger so I had to find one locally quick and the ONLY store that had it in my area was Verizon but it wasnt a Samsung branded OEM charger, It was a Verizon charger that was suppose to be the same but It doesnt charge via USB and Im wondering if for some reason its not suppose too? It charges USB when the Tab is off but when its on it doesn't? I can only charge it via wall charger when its on? So, is That normal? Or, does the OEM USB charge it while its on and this Verizon one is just messed up? Thanks.

Yeah. I got the Samsung Charger. Charging through USB from a computer is super slow to useless.
Only plugging to a wall provides sufficiently speedy charging.

The Tab is quite greedy for power and using either the USB port on a PC or a low Amp rated Mains USB charger will result in either the phone charging very slowly or not responding whilst under charge.
Charging the Tab using the USB and a PC, well there's nothing you can do about it as the USB standard only distributes 0.5 amps (500 milliamps) of power through each port.
Mains chargers however are rated higher but most common one's only have a Max of 1.0 amp.
What you need is a charger that has the capacity to deliver 2 amps.
Check Google & Ebay, there are a number of chargers available rated at 2 amp.

So usb charging while the tab is on is impossible, right? The charger charges fine plugged into the wall, I just needed to know if it not charging via usb while the tab is on was normal, and from what I get from what your saying is that it is normal, it will not charge usb while the tab is on... thanks.
Sent from my SPH-D700 using XDA App

ykman1 said:
So usb charging while the tab is on is impossible, right? The charger charges fine plugged into the wall, I just needed to know if it not charging via usb while the tab is on was normal, and from what I get from what your saying is that it is normal, it will not charge usb while the tab is on... thanks.
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
No, I didn't say it was impossible. I said charging via the USB port on a PC will either be very slow or may not respond whilst under charge, it's certainly not the best method. It's just that with only 500 milliamps of power trickling through the USB port, the second you start to use the Tab in anything that requires a decent amount of power you are not going to get any charge.
The only way I find an ability to charge the Tab under a USB connection when connected to a PC is to let the screen on the Tab turn off and not to touch it. It will still happily communicate with your PC and send/receive data but it will take a much, much longer time to charge that's all.

I gotcha, so...when my tab is on it says not charging in the status but if I let it sleep it actually will just very slow... I understand what your saying and thank u for your time, I just wanted to make sure it wasn't the usb cable I got to know to take it back or not...
Sent from my SPH-D700 using XDA App

I charge mine at night via USB to my computer. Starts around 20% by the time I plug it in. I don't power off the tab. Always has a full charge in the am.

I have a double usb cable that is used to power an external drive. I would need a female to female adapter, but this should provide more power to the GT.

ykman1 said:
I gotcha, so...when my tab is on it says not charging in the status but if I let it sleep it actually will just very slow... I understand what your saying and thank u for your time, I just wanted to make sure it wasn't the usb cable I got to know to take it back or not...
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
Yes, providing the cable you have charges when using with a mains plug then yes, the cable is good.
If however the cable did not charge even when using it with a mains plug then definately you would have a sync only cable.

Thanks, I'm just gonna let it sit overnight with it on sleep n see what happens
Sent from my SPH-D700 using XDA App

ykman1 said:
Thanks, I'm just gonna let it sit overnight with it on sleep n see what happens
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
No problem.
If you think it deserves a Thank You vote please do add one for me.
All votes of thanks goes to charity.
Basically for every vote I receive where I have helped someone my nrses have the authority to grab my wallet and deduct £10 from within which then goes to charity.
Happy New Year.
Beards

Lol I def will hit the button when I'm home, don't think u can do it from the app...
Sent from my SPH-D700 using XDA App

ykman1 said:
Lol I def will hit the button when I'm home, don't think u can do it from the app...
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
Cheers..... My Nursing Staff will appreciate the kind offer of thanks.
..... and my wallet will say "oh no, not again".

To charge through your PC with official USB cable, you should make your own USB "bridge"as short the data wire while insert an 33K om resister between gcc and data wire, an 10K om resister between gnd and data wire.
Sent from my GT-P1000 using XDA App

Yep... I left it on the usb in sleep and it did charge so the cables fine, It just sucks that it doesnt when the tab screen is on but oh well... If theres any solution to fixing this that it charges well from usb then let me know, I know someone just commented about modding the cable to work but theres gotta be a better solution...

Sounds like u bought a stolen tab. No charger or box?
Sent from my SGH-T959 using Tapatalk

Lol, naw... Its clean.
Sent from my SPH-P100 using XDA App

just used a spare double-headed cable from a portable hdd that fortunately has a full size usb plug on the other end. (Most have mini-usb at the drive end)
I use it with a female-female usb adapter and it works pretty well for the PC, particularly on USB 3.0 ports.
I also saw these on Amazon:
amazon dot com/Apricorn-Power-Adapter-Cable-AUSB-Y/dp/B000JIOHDE
I believe Blackberry do one for the Storm as a standard accessory as well
For the car I got a car charger designed for iPad with a USB socket that delivers up to 2.1A
Belkin has the car charger
belkin dot com/IWCatProductPage.process?Product_Id=525940
(I should say, I don't actually have this one, mine is a generic brand that also has a 1A usb socket)

cheap chargers....
Just for you to know (and anyone that its taking a look at this old posts) :
http://www.dealextreme.com/p/mini-3...-for-samsung-p1000-p1010-white-115526?item=18
and there is blue and black versions, as i saw so far...

Zeron.Wong said:
To charge through your PC with official USB cable, you should make your own USB "bridge"as short the data wire while insert an 33K om resister between gcc and data wire, an 10K om resister between gnd and data wire.
Sent from my GT-P1000 using XDA App
Click to expand...
Click to collapse
no need for all that, just plug it in computer USB and wait it take sometime but it charge, because pc USB are not powerful enough to feed 2A to the tab.
If I helped you, please press the thanks button ;-)

Aftermarket Charger

I got an aftermarket charger in my area since original ones were not available. It says on the label though it's for Galaxy Tab but the max amp is 2100mA min 150mA and the usual 5volts. Is it safe to use even if the original one says 2000A?
Sent from my GT-P1000 using XDA Premium App

Anyone?
Sent from my GT-P1000 using XDA Premium App

charger
Yes,where did u get it,I need one

Just some cell phone shop in my area. My original question was I was asking if it's safe to use even if it has higher amps.
Sent from my GT-P1000 using XDA Premium App

technically, its ok to charge at a higher amperage, it would just entail that you would be able to charge it faster.
but there might be a risk of overheating the battery during charging and that might lead to problems in the long run.
on the other hand, 100mA wouldn't be much of a difference.

It will be perfectly fine. The units charging circuitry will only use as much current it requires, heck you could charge it from a 10Amp 5volt supply with no troubles. I have used in the past an old pc power supply rigged up to some usb sockets to charge various usb devices without any trouble. They are capable of supplying upwards of 20amp @ 5volt.
Btw, i am a qualified electronics technician of 12years experience, i have experimented a LOT.

@baskarz thanks for clearing everything up baskarz.
@prinzhernan could you post a pic of what the charger looks like? thanks

baskarz said:
It will be perfectly fine. The units charging circuitry will only use as much current it requires, heck you could charge it from a 10Amp 5volt supply with no troubles. I have used in the past an old pc power supply rigged up to some usb sockets to charge various usb devices without any trouble. They are capable of supplying upwards of 20amp @ 5volt.
Btw, i am a qualified electronics technician of 12years experience, i have experimented a LOT.
Click to expand...
Click to collapse
Thanks a lot you two for taking time to explain. I understand it all now.
Will post a pic when I get home.
Sent from my GT-P1000 using XDA Premium App

Sharing link to aftermarket charger
Hi guys
Share my aftermarket charger with you all
http://www.wsdeal.com/ID321W/YXT023_US_2_in_1_Micro_Home_USB_Charger_with_Charge_Syne_Cable_for_Apple_iPadiPhone_4G3GS_White.ws
Takes 4 hours to charge from 10% to 100%.
Shows "CHARGING" word
Below 2A charger does NOT work on SGT, shows "NOT CHARGING"
http://www.mobilefun.co.uk/powerhub-4-port-usb-charger-p19416.htm
http://www.chinavold.com/dual-usb-p...e-ipod-eu-plug-with-charging-cable-p-196.html
Although both says 2000mA, but does NOT work on SGT, I was lucky the retailer let me trial-run at home.
Results = takes 10 hours to charge from 10% to 100% same like notebook or desktop USB with software upgraded (USB fast charging from ASRock) tested on ASRock mobo and Thinkpas T60.
Make sure to buy only when box PRINTS for GALAXY Tab !!!

cx5 said:
Hi guys
Share my aftermarket charger with you all
http://www.wsdeal.com/ID321W/YXT023_US_2_in_1_Micro_Home_USB_Charger_with_Charge_Syne_Cable_for_Apple_iPadiPhone_4G3GS_White.ws
Takes 4 hours to charge from 10% to 100%.
Shows "CHARGING" word
Below 2A charger does NOT work on SGT, shows "NOT CHARGING"
http://www.mobilefun.co.uk/powerhub-4-port-usb-charger-p19416.htm
http://www.chinavold.com/dual-usb-p...e-ipod-eu-plug-with-charging-cable-p-196.html
Although both says 2000mA, but does NOT work on SGT, I was lucky the retailer let me trial-run at home.
Results = takes 10 hours to charge from 10% to 100% same like notebook or desktop USB with software upgraded (USB fast charging from ASRock) tested on ASRock mobo and Thinkpas T60.
Make sure to buy only when box PRINTS for GALAXY Tab !!!
Click to expand...
Click to collapse
2A chargers will work with the SGT, but you need an adapter like these that I bought.
http://cgi.ebay.com/USB-car-wall-ch...ccessories&hash=item2c5c07736b#ht_3085wt_1163
Reason is the ones that says "For Galaxy Tab" chargers have resistors soldered to the usb port allowing the SGT to know it's connected to an AC adapter and to pull the full amount of power it needs. The adapters have the resistors in them allowing u to use any cheap charger. It allows you to charge with a standard computer/laptop usb port as well. I think it's supposed to charge faster than the trickle charge you get without the adapter but I have yet to try it out. There's another thread that goes into way more detail about it and even how to solder your own resisters to make your own adapters. Think it was this one: http://forum.xda-developers.com/showthread.php?t=845844&highlight=usb+charge

you can charge anywhere were there is a USB port. Just make this.
http://forum.xda-developers.com/showthread.php?t=845844&page=3
that tells your galaxy tab to DRAW POWER from the USB port thinking it is the supplied CHARGER. you can use ANY USB port or charger with this.

Ricey said:
Reason is the ones that says "For Galaxy Tab" chargers have resistors soldered to the usb port allowing the SGT to know it's connected to an AC adapter and to pull the full amount of power it needs.
Click to expand...
Click to collapse
Hi Ricey
Correcto, my post can help anyone who wants a 2nd charger to be permanent in office or etc
And most importantly not buy the regular 2A without the resistors inside.

Awesome. Sounds great.

USB Cable type WILL affect charging speed

Hi all
Am a 4 day old owner of a rooted/bootloader-unlocked Nexus 4 with stock 4.2.1 and franco Kernel
On the first day it took me 6 hours to fully charge my phone (I put it down to me using the phone non stop whilst charging), subsequent charge attempts took on average 4-5hours which shocked me
Reading one of the threads here which recommended using this app called Current Widget (play.google.com/store/apps/details?id=com.manor.currentwidget&hl=en) to check if my phone is detecting charging from a wall wart properly.
I did this and realised:
- I charged fastest using the supplied USB Cable (Current widget reading was Averaging 700mA which when added to 450mA-my screen on power draw, gives 1150mA, close to the charger's 1200mA output)
- Tried 3 other cables and they did not charge as fast (got and average of 300mA to 500mA)
I looked close at the cables and beside length the only differences i found were the markings on the cables.
Namely:
Original Cable: Style 20851 80degrees 30v VW-1 28AWG/2C + 24AWG/2C
Others: Style 2725 AWM 30v VW-1 28AWG/IPC + 28AWG/2C or variations of this. (I tried 3 different cables)
To be sure i also tested this with other USB adaptors, I had an adaptor with 2.1mA output and saw the same results (Note: phone still drew only max 1200mA when the adaptor could supply more)
TL : DR
- The best USB cable to use is the ones that are rated "28AWG/2C + 24AWG/2C" with the marking on the wire itself.
- This is because the power is delivered over the thicker 24AWG rated wires.
- Purchased 3 more "28AWG/2C + 24AWG/2C" micro usb cables online to verify this, will update thread once tested.
Please test and share your findings here too!

Yep, less resistance from the thicker cable.

Rusty! said:
Yep, less resistance from the thicker cable.
Click to expand...
Click to collapse
Comes as a shock to me as these cables I owned were used originally with my old blackberry (before my iphone days, this is my first android!) and they didnt make any difference to charge time, guess they were not drawing as much current and so was not affected by cheaper quality usb cables!

Agreed the one from my nexus 7 works wonders. Another thing is, believe it or not, plug the cable into the phone first than while connected plug it into the wall.
Sent from my Nexus 4 using Tapatalk 2

Is the cable that came with the phone USB 3.0? I remember reading on the nexus 7 forums that the factory cables are USB 3.0. It was the same thing with the nexus 7 it would charge quite a bit faster with the factory cable than any other microusb I had.

neotekz said:
Is the cable that came with the phone USB 3.0? I remember reading on the nexus 7 forums that the factory cables are USB 3.0. It was the same thing with the nexus 7 it would charge quite a bit faster with the factory cable than any other microusb I had.
Click to expand...
Click to collapse
Not 3.0
Sent from my Nexus 4 using XDA Premium HD app

more to do with the resistance between the data pins.

Found a post about this here.
http://voyager8.blogspot.com/2013/04/how-to-choose-good-usb-data-and.html?m=1
The second code after the + sign denotes the power rate. Anything lower than 28AWG, will charge faster. Which is why 24AWG is faster than 28AWG. The lower number, the better.

Time to charge the phone

Hi,
how long do your XZs need to charged? I got a 3m usb cable to charge my phone using the docking station and have the feeling it was taking longer than before. Currently it charged 50% in 1h 40min.
I hope it isn't bad for battery health

ccab said:
Hi,
how long do your XZs need to charged? I got a 3m usb cable to charge my phone using the docking station and have the feeling it was taking longer than before. Currently it charged 50% in 1h 40min.
I hope it isn't bad for battery health
Click to expand...
Click to collapse
How are you charging the phone? Via USB 2.0 on a computer OR using the supplied Sony charger that came with the phone?
Also, what dock is it?

Sony DK26 dock, Sony charger

ccab said:
Sony DK26 dock, Sony charger
Click to expand...
Click to collapse
If you are charging it via PC via usb 2.0 (black) it will only charge at 500mA which is really slow. If you try a USB 3.0 (blue) slot it charges at 900mA which is faster. If you use the charger that came with the phone it will charge way faster since it's 1.5A (1500mA)

As I already said in my previous post, I'm using the original Sony Charger.
It charged so slow that it must have been about 700mA per hour. I think I'll search for another micro usb cable, that allows me to charge faster

ccab said:
As I already said in my previous post, I'm using the original Sony Charger.
It charged so slow that it must have been about 700mA per hour. I think I'll search for another micro usb cable, that allows me to charge faster
Click to expand...
Click to collapse
Slow charging is better charging! I use a charger from an older smartphone.. 875mA..

Takes about an hour to get 20-70, another hour for the remaining 30%. But I keep it at 20-80 at most times because most guides told me so .
Over night i plug it to pc. and it actually had 0 to 78 on 5 hours so its pretty slow

ccab said:
As I already said in my previous post, I'm using the original Sony Charger.
It charged so slow that it must have been about 700mA per hour. I think I'll search for another micro usb cable, that allows me to charge faster
Click to expand...
Click to collapse
Sorry misread that lol. I don't know why the USB cord sony supplied can't be longer? My SGS3 cable was way longer and i liked that. I wonder if a usb extension would be a better choice since the original cable is really good quality....

ccab said:
Hi,
how long do your XZs need to charged? I got a 3m usb cable to charge my phone using the docking station and have the feeling it was taking longer than before. Currently it charged 50% in 1h 40min.
I hope it isn't bad for battery health
Click to expand...
Click to collapse
The problem is your cable,3m is very long to keep the mA power.
Sent from my C6603 using xda premium

gm007 said:
The problem is your cable,3m is very long to keep the mA power.
Sent from my C6603 using xda premium
Click to expand...
Click to collapse
Interesting, I have a 1.5m USB cable (not the sony) and using the OEM sony charger it will just barely charge my Z. So maybe my issue is the cable length.. I'll try it with the sony USB cable tonight to see if this fixes my problem.

[Q] Nexus 7 alternate charger

I am looking for NEXUS 7 alternate charger which can charge at the same speed the Original Nexus 7 charger charges
unfortunately my nexus 7 original charger has been Burnt Becoz of Charging on UPS Inverter
and i cannot find the Geniune charger Locally
so is there any possiblity i can charge my NEXUS 7 to any other CELLPHONE charger which can charge it to the Same Speed what original does
i bought IPAD3 Charger and that one is charging too much slow need solution

pleasant said:
I am looking for NEXUS 7 alternate charger which can charge at the same speed the Original Nexus 7 charger charges
unfortunately my nexus 7 original charger has been Burnt Becoz of Charging on UPS Inverter
and i cannot find the Geniune charger Locally
so is there any possiblity i can charge my NEXUS 7 to any other CELLPHONE charger which can charge it to the Same Speed what original does
i bought IPAD3 Charger and that one is charging too much slow need solution
Click to expand...
Click to collapse
That's because the iPad charger doesn't have the data pins shorted out to enable fastcharge . Easiest way to accomplish fastcharge with your charger, is to buy a charging cable (data pins shorted out, so it is not a data cable:
http://dx.com/p/usb-male-to-lengthe...for-samsung-i9500-9300-htc-white-100cm-207353
It even has the lengthened micro usb connector the Nexus 7 needs.
Or maybe better, buy this one, found in another thread here on XDA, this one is confirmed to work in fastcharge mode with any usb charger:
http://www.monoprice.com/products/p...=10303&cs_id=1030307&p_id=5457&seq=1&format=2
Good luck!
Sent from my Nexus 7 using xda app-developers app

rkuijpers said:
That's because the iPad charger doesn't have the data pins shorted out to enable fastcharge . Easiest way to accomplish fastcharge with your charger, is to buy a charging cable (data pins shorted out, so it is not a data cable:
http://dx.com/p/usb-male-to-lengthe...for-samsung-i9500-9300-htc-white-100cm-207353
It even has the lengthened micro usb connector the Nexus 7 needs.
Or maybe better, buy this one, found in another thread here on XDA, this one is confirmed to work in fastcharge mode with any usb charger:
http://www.monoprice.com/products/p...=10303&cs_id=1030307&p_id=5457&seq=1&format=2
Good luck!
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
I am using the same cable that came with nexus 7 original charger only adaptor is being used of ipad

I use the blackberry playbook charger with no issues.
Much longer cable also.

pleasant said:
I am using the same cable that came with nexus 7 original charger only adaptor is being used of ipad
Click to expand...
Click to collapse
Yes I know, and that's the reason the iPad charger won't work on fastcharge.
You need to either shortout the data pins of the iPad charger, or use a charger cable with shorted data pins ( a so called charge-only micro usb cable) to make the iPad charger use full capacity (fastcharge mode). There are also cable adaptors for sale that will shortout the data pins for you.
Cryingmoose said:
I use the blackberry playbook charger with no issues.
Much longer cable also.
Click to expand...
Click to collapse
Yep, that one works because it follows the USB standard rules, and not the Apple USB standard.
No iDevice (iPhone/iPad) charger will fastcharge an android phone or tablet without modifying the datapins or use a charge-only cable / adaptor.
The Blackberry Playbook charger is known to work

Get an HP touchpad charger if you can. I can provide empirical evidence that it will actually charge your n7 20 minutes faster than the stock charger. I posted a thread about it here some time ago. "Best aftermarket charger ..." Or something like that.
Plus, my HP touchpad charger hasn't failed to work with whatever device I've plugged into it - idevice or android.
Sent from my Galaxy Nexus using xda app-developers app

vote for HP touchpad charger
pleasant said:
I am looking for NEXUS 7 alternate charger which can charge at the same speed the Original Nexus 7 charger charges
unfortunately my nexus 7 original charger has been Burnt Becoz of Charging on UPS Inverter
and i cannot find the Geniune charger Locally
so is there any possiblity i can charge my NEXUS 7 to any other CELLPHONE charger which can charge it to the Same Speed what original does
i bought IPAD3 Charger and that one is charging too much slow need solution
Click to expand...
Click to collapse
I will suggest the HP touchpad charger for use with the N7... they work great and produce no noticeable heat when not connected... shows good efficiency.:good:
Check Ebay -= just did a quick search and got 131 hits anywhere from 8-20 USD. I"ve bought 2... one is firmly set to be my preferred travel charger for any USB device.

+1 Re: HP Touchpad charger
Someone did a in depth look at factory and aftermarket chargers and it came out way better in terms of current provided and cleanliness of power without spikes or dropouts.
Sent from my Nexus 7 using Xparent Purple Tapatalk 2

http://forum.xda-developers.com/showthread.php?t=2245915

zuberio said:
Get an HP touchpad charger if you can. I can provide empirical evidence that it will actually charge your n7 20 minutes faster than the stock charger. I posted a thread about it here some time ago. "Best aftermarket charger ..." Or something like that.
Plus, my HP touchpad charger hasn't failed to work with whatever device I've plugged into it - idevice or android.
Sent from my Galaxy Nexus using xda app-developers app
Click to expand...
Click to collapse
Do I still need a aftermarket cable w/ the data pins shorted out? Or will this all in one package: http://www.ebay.com/itm/Genuine-HP-North-American-Power-Charger-FB341AA-AB-for-TouchPad-Cable-/251250614212?ssPageName=STRK:MESE:IT Do the trick?

magicdot said:
Do I still need a aftermarket cable w/ the data pins shorted out? Or will this all in one package: http://www.ebay.com/itm/Genuine-HP-North-American-Power-Charger-FB341AA-AB-for-TouchPad-Cable-/251250614212?ssPageName=STRK:MESE:IT Do the trick?
Click to expand...
Click to collapse
That will do the trick - but you don't need another cable if you already have one.

I went with the charger without cable option and got 2 chargers for less than that price. Just have eBay sort the search results by price+shipping and optionally USA sellers only to find a better price without waiting for a slow boat from China.
Sent from my Nexus 7 using Xparent Purple Tapatalk 2

containing ndoxima
bsoplinger said:
I went with the charger without cable option and got 2 chargers for less than that price. Just have eBay sort the search results by price+shipping and optionally USA sellers only to find a better price without waiting for a slow boat from China.
Sent from my Nexus 7 using Xparent Purple Tapatalk 2
Click to expand...
Click to collapse
Will using chargers not putting out the proper amperage cause any hard ware issues? Just curious.
Thanks

bidzer said:
Will using chargers not putting out the proper amperage cause any hard ware issues?
Click to expand...
Click to collapse
If the charger puts out less than the tablet needs then it will just charge slower (or not at all if it's really low) and if it puts out more than the maximum the tablet uses the extra will just go unused. Voltage is a different issue.
Sent from my Nexus 7 using Xparent Purple Tapatalk 2

bidzer said:
Will using chargers not putting out the proper amperage cause any hard ware issues? Just curious.
Thanks
Click to expand...
Click to collapse
Having your device plugged into a USB 2 500mA computer port obviously charges slower then a 2000mA wall charger. It would be pretty faulty design if plugging your device into your computer would cause hardware damage.

Man, this really sucks, the Monoprice cable mentioned earlier in this thread is having the same issue I had with another micro USB cable, it doesn't seem to fit into the Nexus 7 snugly, it doesn't seem to go in all the way. (I hope I don't have a busted charging port), It doesn't seem to charge it at all, even with the stock Nexus AC adapter. I'm about to break down and buy the official Google charger again, even if all I need is a new micro USB cable.

I'm using 2 different monoprice cables, one in my car and one at home, and both fit well. Sounds like the port has gotten damaged.
Sent from my Nexus 7 using Xparent Purple Tapatalk 2

So, I just decided to buy a whole new charger off Amazon. If that won't work and I determine that the micro USB port is busted, I'm not going to be very happy, haha. does anyone know if Google repairs them for a fee?

I use a Playstation Vita charger which seems to charge my N7 very fast. On the other hand, I've tried an old mobile charger also and the battery level goes down whilst plugged into it.

If under warranty and purchased from the PlayStore, yes, otherwise, if under warranty, ASUS.