Hi
I've realised, that sometimes charging of my S5 takes relatively longer.
I've measured the current with cheap USB current-voltage-metter, and I've found out, that depending on the micro-usb cable, the charging rare may varry form 0.3A to 1.3A (in measured case). The original charger is rated 5.3V 2.1A
When nothing connected, the charger gives 5.2V (5.19V).
On connected device, it jumps up in range of 5.25 - 5.4V
My measurements were conducted with 49% phone battery charge.
The results:
On original S5, S2 (and some random cables), the current was about 1.15A
Second "stage" of cables performed with 0.7A
Last "bath" chargerd the phone only with 0.3A
So the Question is:
Is there some cable-detection on the phone site? In the IPhone there is prottection, that will disable charging unless You provide >0.6-0.7A initial charging current (I've tested that).
So I guess there is some similar protection is S5. (Why steps of 0.3A 0.7A 1.15A)?
Do You know how it is performed? Anything more in this topic? Is this just a matter of cable, or maybe there is some resistance measured (over D+ D- wire?)?
The cables:
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The measurements:
Related
hi all
i'd like to ask your opinion on what this fault
i purchased a xda2 which i use in my car with a gps reciever & satnav software. the cable i use is in the pic below. it connects to the ciggy lighter and then powers the gps box and powers/charges the phone at the same time.
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the problem is that if the battery is below about 35% and i plug it into the car charger and turn on the gps stuff the battery doesn't charge eg. battery showing 18%. i plugged it into car charger and turned on gps stuff. drove 20 mins home and battery was showing 8 % by the time i got home even though the battery status thing shows as charging.
BUT
if the battery is at about 70 % and i use it in my car with all the gps stuff it charges fine.
does this point to a faulty battery or something more serious
thanks for any input.
It is all about the mA. check out the mA specifications on the cable. 500 mA output is too low. 1000mA is ok.
Hello guys.
I have a Nexus 7, with a huge problem.
Ever since my little sister took it to Europe (and plugged it into a 220 volt instead of the 110 that we use here in the U.S), it died. Now, I've opened it and checked if the battery was somehow poorly plugged or something, but nothing.
The device will not turn on unless connected to a power source (and even then, not 100% of the time) (both my Macbook and wall work). This is what it looks like:
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Is this a battery problem? Or a screen problem?
Also, when I took these pictures, it was the first time I could see the "Google" logo on the screen (although barely)
Any help would be greatly appreciated!
From the look of it you have either a damaged motherboard or screen. The motherboard is probably more likely. Can you check on your charger and see what the input voltage is some chargers can cope with 100-240v. What happens when you turn it on/plug it into a computer does it boot is it recognised by the computer? And lastly is there any possibility it was dropped?
Its possible that doubling the input voltage may have produced a surge in the usb voltage but it would be more likely to just fry your charger.
Sent from my Nexus 7 using xda app-developers app
Hi everyone,
Looking for an external battery to the phone I9505 Galaxy S4. I found two that I liked, but I'm trying to figure out if I can use them in any way spoil the phone.
It's about 2 batteries, which look identical (as shown below), but differ in capacity and power input:
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Code:
Capacity: 3200mAh
Input: DC 5V / 800mAh
Output: DC 5V / 800mAh
Charging Time: 3H
Cycle Life: 500 times
Code:
Capacity: 4500mAh
Input: DC5V / 500mA
Output: DC5V / 800mA
Charging Time: 8 hours
Cycle Life: 500 times
If any input power may cause problems?
The second thing is that on many pages I found the link that these batteries are designed for models I9500 - the point is.. if you take a percentage of these models, eg on ebay is only 1/10 was an indication of the model I9505. Is it safe to use both batteries?
The third issue is whether it is true that the longer (slower) the battery was charged, the greater lifetime retains ?
I appreciate any advice.
Best regards
Goodday folks, So i have a 910F running stock android 5.0.2 i recently noticed that sometimes my battery charges really slow from 90% till 100% to measure charging current i download an app called battery monitor by 3c. The current seems to be normal however i noticed another weird issue that my phone continues to draw some power from charger even when the battery indicator is full with green led (the draw seems to be going down around 100ma when i took it off) . Im using stock fast charger and cable can anyone else confirm if this is normal or if i have a defective unit? Attaching a picture for reference. Thanks
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it will draw power to keep the battery at 100%
and it's normal for the charging rate to go down a bit when almost full.
a battery produces more heat while charging when it's almost full, so they need to slow down the charging to reduce the heat production.
I received a faulty Tab A (soft brick) which I was able to fix, however it seems to charge very slow. I used 3 different chargers for a Samsung and Xiaomi mobiles and Asus tablet, all around 2-4a, but they all charged at the same rate. It took 5hrs to reach 94%. I left it on flight mode for the last 24hrs and it's only dropped 1% (which is amazing) so I'm sure it's not the battery at fault. If multiple chargers/cables are charging at the same rate and the battery loss is solid I'm guessing it could be the USB port. If not, what else could it be? I don't know the history of this tablet as they just dumped it on me.
Very shallow curve, it should be a lot steeper:
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Hello, I own a T585 and I can tell you that this is very picky with loading ports.
I have a multi loader (Easyacc) and the Tab is only with 2.1 Ampere fast charging.
Not with 1.0 not with 2.4 not with more.
Reccomend you to use a similar charger or a original.
I didn't quite understand what you mean. So I have to use a 2.1a charger or original Tab A charger only? I found them in 5v and 12v, both for Tab A, which one is correct?