Question Charger GW4 - Samsung Galaxy Watch 4

Hello everyone, I have the following question: I think the GW4 charges very slowly, this is due to its low power charger. Could I use another one of greater power, respecting of course, the same output voltage? Is there a problem with battery life if I use a Sony charger with twice the power? Thanks.

You can try to use a charger with 5V/2A instead of the default 5V/1A, but the principal cause of the slow charging is the temperature.
I managed to reduce the charging time attaching a heatsink with non-conductive thermal paste to the base.
You can try using a 10W charger (5V/2A) over a metallic base and send to us if you have any improvement.
I recommend to use a Samsung charger, because is more likely that has the same ripple and other electrical parameters in the same range as the stock charger.

Ok. Thanks

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[Q] charger question

Hello,
I have a micro usb charger that cam with my hp touchpad. looking at the label it seems like it supplies a 2A current as opposed to the 1A our phone takes. Can i use it on the G2x resulting in faster charging or will i damage the battery?
thanks,
Ismail
imoumni said:
Hello,
I have a micro usb charger that cam with my hp touchpad. looking at the label it seems like it supplies a 2A current as opposed to the 1A our phone takes. Can i use it on the G2x resulting in faster charging or will i damage the battery?
thanks,
Ismail
Click to expand...
Click to collapse
You can use it as long as it supplies the correct the voltage. I use a 2amp charger with my G2X and I love how fast my phone charges. The phone will only draw as much as it can.
A faster charge results in a hotter battery. Some people think fast charging the battery is also the cause of the infamous SOD (Sleep of Death). Keep an eye (or ahnd) on your phone and make sure it is not getting too hot while on the charger.
phburks said:
You can use it as long as it supplies the correct the voltage. I use a 2amp charger with my G2X and I love how fast my phone charges. The phone will only draw as much as it can.
Click to expand...
Click to collapse
The hotter the battery goes, the shorter the battery life span will result as li-ion battery doesn't quite like in hot temp. Never tried a 2A charger to charge my G2X, so I would not know. But I am using a 1A charger to it and it works great If 2A charges does not cause the battery to go too hot, it should be fine.
I've been using this charger since May with no issues. The battery will only draw as much as its capable of drawing. As long as the voltage is the same as the stock charger then there is no issue. You could connect it to a 5 amp charger and it would still only draw the 1.x amps its designed to draw.
Going too low on amperage is where you have to be careful.
thanks for the replies, turns out that 2A charger is 5.3V as opposed to the 4.8V LG charger...
phburks said:
I've been using this charger since May with no issues. The battery will only draw as much as its capable of drawing. As long as the voltage is the same as the stock charger then there is no issue. You could connect it to a 5 amp charger and it would still only draw the 1.x amps its designed to draw.
Click to expand...
Click to collapse
+1 on that, LG may be dumb, but they're not dumb enough to let their phone overload with un-needed electricity.

Can i use this charger with my r?

i have bought tablet few days ago and i got usb charger with it (i mean a charger with usb port at end)
that charger have output of 5v and 2000ma
stock samsung charger have output of 5v and 700ma so i thought that if i can use that charger maybe it will help to charge my phone very fast as it have output of 2000ma.
can i use that charger with my galaxy r? can it damage to my phone or it's battery?
xlm13x said:
i have bought tablet few days ago and i got usb charger with it (i mean a charger with usb port at end)
that charger have output of 5v and 2000ma
stock samsung charger have output of 5v and 700ma so i thought that if i can use that charger maybe it will help to charge my phone very fast as it have output of 2000ma.
can i use that charger with my galaxy r? can it damage to my phone or it's battery?
Click to expand...
Click to collapse
It would not be recommended as it may actually damage the battery or even the charging circuit which charges the battery in your R if it can't withstand the higher rate of charging.
'cooleagle' said:
It would not be recommended as it may actually damage the battery or even the charging circuit which charges the battery in your R if it can't withstand the higher rate of charging.
Click to expand...
Click to collapse
thanks, i will stay away from that tab charger don't wanna damage my phone
A higher amp output should be ok.
A higher voltage is the one you should be worried about.
s4sixty said:
A higher amp output should be ok.
A higher voltage is the one you should be worried about.
Click to expand...
Click to collapse
But cooleagle said maybe it can damage battery and/or charging circuit
Sent from my GT-I9103 using XDA
Simple Guidelines When Buying a Charger
Use the correct charger for battery chemistry. Most chargers serve one chemistry only.
The battery voltage must agree with the charger. Do not charge if different.
Within reasons, the Ah rating of a battery can be higher or lower than specified. A larger battery will take longer to charge than a smaller one and vice versa.
The higher the amperage of the charger, the shorter the charge time will be. There are limitations as to how fast a battery can be charged.
Accurate charge termination and correct trickle charge prolong battery life.
When fully saturated, a lead acid charger should switch to a lower voltage; a nickel-based charger should have a trickle charge NiMH; a Li-ion charger provides no trickle charge.
Chargers should have a temperature override to end charge on a malfunctioning battery.
Observe the temperature of the charger and battery. Lead acid batteries stay cool during charge; nickel-based batteries elevate the temperature towards the end of charge and should cool down after charge; Li-ion batteries should stay cool throughout charge.
Souce : http://batteryuniversity.com/learn/article/all_about_chargers
One more reason why we should be extremely cautious when using other chargers is that when using the charger provided by Samsung I have observed that the charger cuts off the supply to the battery when the battery reaches 100 %.
It may not be the same when using other chargers which will lead to over charging the battery. This continuous over charging can reduce the life of the battery.
Lastly you can experiment as much as you want ( BTW that's why most people are on this forum ) its your decision, but see to it that you are not damaging the battery or the handset in the process.
Its not the charger that cuts off power supply to the phone.
It's the memory chip inside the battery that supplies information to initiate the cut off.
That is why it's highly recommended to use original batteries in ur phone so that the phone will not burst into flames !!!
A Smart Charger, on the other hand, has a built in circuitry that does the cutting off and after that continues to trickle charger the batteries to maintain the charge on the batteries. U can usually see this for car chargers.
These chargers cost way more than ur average Samsung charger.
Cheers !
thanks for guys for giving your valuable opinions
today i thought i should give it a try
i used stock micro usb to usb cable to connect with that charger and plugged in but something weird happened
when i plugged in charger screen lights up with with notification tone as usual but touch screen stopped responding
both touch screen and touch sensitive buttons stopped working only home button was working after removing that charger all things started to work again normally really strange
xlm13x said:
when i plugged in charger screen lights up with with notification tone as usual but touch screen stopped responding
both touch screen and touch sensitive buttons stopped working only home button was working after removing that charger all things started to work again normally really strange
Click to expand...
Click to collapse
Don't use that one again buddy !
'cooleagle' said:
Don't use that one again buddy !
Click to expand...
Click to collapse
yeah for sure i love my phone

.7 Amp vs 1.0 Amp Charger

So the One X comes with a 1.0 Amp charger. The charger would not fit(too long) in the spot where I have been using my Samsung charger.
I compared the two and saw the only difference is the .7 A to 1.0 A. looked up if it was ok to use. Some even reported longer battery life with the slower charger. Makes some sense just lasts longer.
Maybe I am crazy but it seems like I get better battery life from the .7 charger.
I have went back and forth a few times....But of course not enough days to really tell.
thoughts?
Definitely overthinking it. It will just charge slower.
eallan said:
Definitely overthinking it. It will just charge slower.
Click to expand...
Click to collapse
Yep, what he said.
To think of it another way, you can charge your phone via a USB connection to your computer, but it's much slower. This is because USB only provides 0.5 (or maybe it's 0.2?) Amps.
However, going with an adapter that's HIGHER than 1.0A could cause damage.
In the long run, slower charges will likely make your battery last more cycles. But on a per-cycle basis, it should not give better battery life.
If you run your battery down, the smaller charger (and definitely the case for PC USB because they max out at 500ma) may not be able to charge at all. In normal cases, it is fine.
Higher than 1a won't damage anything. .7 might not actually charge the battery 100% depending on if the phone thinks it is usb(500ma charging mode) or ac charger(wont charge properly).
Sent from my Desire HD using XDA
c5satellite2 said:
Higher than 1a won't damage anything. .7 might not actually charge the battery 100% depending on if the phone thinks it is usb(500ma charging mode) or ac charger(wont charge properly).
Sent from my Desire HD using XDA
Click to expand...
Click to collapse
This. The voltage is what really matters. The phone won't draw more than it can to charge. If it draws 1A while charging and you put it on a 2A charger, it will pull 1A. But if the voltages don't match up and there isn't a protection circuit for that type of problem, you could fry the electronics with a higher amperage.
100% on the voltage! That is the important one. .7a shouldnt be recognized as a real ac charger resulting in the phone thinking it is USB 500ma charging mode which is the same as pc, slow. If the device thinks the .7a charger is ac charging mode, the battery probably will never charge to 100%. In fact if you were at 100%, and the phone was in ac charging mode with a .7a charger, it would drain your battery! More than 1a, the phone will only draw what it is capable of. Some aftermarket chargers will still charge in USB 500ma mode because the phone won't recognize them as ac charging 1a mode. I had an old HTC charger once that did funny things to my inspire, it would open navigation every time it was plugged in(thought it was a car dock I guess). Use real OEM chargers if possible. They will charge the fastest, and you won't have issues. The real HTC chargers at 1a are much faster than the aftermarket chargers I have tried. I have a good Kensington 1a car and wall charger, and the HTC blows them away as far as speed!
Sent from my Desire HD using XDA
c5satellite2 said:
100% on the voltage! That is the important one. .7a shouldnt be recognized as a real ac charger resulting in the phone thinking it is USB 500ma charging mode which is the same as pc, slow. If the device thinks the .7a charger is ac charging mode, the battery probably will never charge to 100%.
Click to expand...
Click to collapse
Actually, AC charging mode or PC USB mode is not determined by amprage or volts (all use 5v). It is determined by how the data pins are terminated. Most non-Apple chargers terminate data pins the same way so they will be recognized as AC charger. Apple chargers are the ones that may not be recognized by the phone as AC chargers because Apple terminates data PINs different than everyone else. Regardless of the charging mode, they all can charge to 100% if they can initiate the charge.
LiIon battery charging circuitary is much more complicated than your normal AA chargers. It is regulated internally so that slightly variations of input voltage won't affect the charging. It has to internally control the charge process precisely so that it can terminate the process at the exact moment (overcharging results in explusion).
Input power supply being 0.7A or 1A has no bearing on the level to which the battery is filled. Even input voltage has no bearing! The only impact to the system will be the rate at which you can charge.
Not true. Some chargers make the device think it is a real ac charger, but do not provide enough to charge to 100%. And yes it has to do with pinout. Some ac chargers aren't recognized properly and results in USB charge mode even if they have more than 500ma available. Even if your pc provides more than the USB standard of 500ma, it will only draw 500ma and charge slowly.
Don't mess with the voltage, it WILL damage your device! The previous post should be ignored, and deleted.
Sent from my Desire HD using XDA
I use my touchpad charger and its 5.3v instead of 5v and its definitely charging my phone faster than the HTC stock charger. No affect on battery life though.
Sent from my HTC One X using XDA
5.3v or 5v is ok because there is a little leeway, and I'm sure the 5.3 isn't exactly 5.3 anyway. If it was, the extra .3v is probably within range, and is not blowing things up, just stressing them a little more, making some heat, and wearing them out slightly quicker.
Try a 12v charger, see what happens. LOL.
Seriously the 5.3v might actually be closer to 5v than a charger labeled 5v and therefore could result in better charging. Remember, input voltage varies as well. Your electricity could go under 100v or as high as 120v. Our electric grid is not very consistent. Supply is constantly being adjusted to meet demand, resulting in widely varying voltages. I have seen it dip into the low 90v range on hot summer afternoons, and rarely in the 115v-120v range where it should be. The 5.0 volt charger would result in the best performance if it was actually putting out a TRUE 5v. A high quality charger, with high quality, consistent, 115v input power that is properly rated is ideal. In reality it doesn't exist.
5.3v close enough, might actually be better. One way to tell, put the voltmeter on it!
If you have access to volt/multimeter, could you post your ac voltage at the outlet and the dc voltage coming out of the 5.3v charger. Could be interesting. How many amps is the charger also? Might have to get one.
Sent from my Desire HD using XDA
Dont have that but this is the link to it
http://www.amazon.com/gp/aw/d/B0055QYJJM
I'll provide the exact specs when I get home.
Sent from my HTC One X using XDA
Can you clarify what you mean by this?
c5satellite2 said:
Not true. Some chargers make the device think it is a real ac charger, but do not provide enough to charge to 100%.
Sent from my Desire HD using XDA
Click to expand...
Click to collapse
Either an input power provides power or it doesn't. The only reason it would "stop" is if the charger in the phone runs out of headroom and I have yet to see this with any AC/DC or USB supply.
The whole issue of whether or not the phone identifies the power supply is an entirely separate discussion. But once it does identify and begin charging it will do so until completion.
---------- Post added at 12:13 PM ---------- Previous post was at 12:05 PM ----------
c5satellite2 said:
The 5.0 volt charger would result in the best performance if it was actually putting out a TRUE 5v.
Sent from my Desire HD using XDA
Click to expand...
Click to collapse
This is not true. Take two AC/DC adapters...
A) [email protected] = 4.24W
B) [email protected] =4.00W
The HTC One X has an internal switching charger with dynamic input power limiting. So it will actually be able to draw MORE current from Adapter A than Adapter B. Also, because the charger in the One X is a switching charger there will be negligible extra heat generated and no excessive wear and tear.
how did you know?
racerex said:
Can you clarify what you mean by this?
Either an input power provides power or it doesn't. The only reason it would "stop" is if the charger in the phone runs out of headroom and I have yet to see this with any AC/DC or USB supply.
The whole issue of whether or not the phone identifies the power supply is an entirely separate discussion. But once it does identify and begin charging it will do so until completion.
---------- Post added at 12:13 PM ---------- Previous post was at 12:05 PM ----------
This is not true. Take two AC/DC adapters...
A) [email protected] = 4.24W
B) [email protected] =4.00W
The HTC One X has an internal switching charger with dynamic input power limiting. So it will actually be able to draw MORE current from Adapter A than Adapter B. Also, because the charger in the One X is a switching charger there will be negligible extra heat generated and no excessive wear and tear.
Click to expand...
Click to collapse
Htc has input power limiting? Internal switching charger? Where did you get this information?
The plugpack will be voltage regulated(to protect from overvoltage with under designed load) not ampage regulated.
The battery charges via voltage float, the higher the voltage the quicker the charge, but the voltage is regulated anyways so there is no fast and slow charge. It is charging or it's not. The charge circuit steps up and down the voltage to give fast/slow charge not the plugpack in mobile phones.
1.0a versus 0.7a just means the rated output is lower. It does not change the load. All that happens is the 0.7a will be running over its rated output which results in running hotter and potential running undervoltage.
Running 0.7a is not good if the battery charge circuit will draw 1.0a by design. Your plugpack just becomes a firerisk.
You should always match the designed specifications, eg 12v 1.0a.
The device expects a 12v(or close) input and should be able to draw 1.0a without issue.
If you over or under volt the charge circuit it could blow up, if you over draw the supply it might melt.
is it ok to charge 0.7A battery with 1.0A charger
omer101 said:
is it ok to charge 0.7A battery with 1.0A charger
Click to expand...
Click to collapse
Did you not read the thread?
Sent from my Evita

[Q] Charger Advice

Hello everyone,
So I have been trying to find the answer to what I am wondering but to no avail. I know that when using a charger that did not come with the phone it needs to have to same voltage to not hurt the battery, but I am unsure of the amps. I know for normal powering of things the charger needs to supply the same amount of amps or higher so that the item can pull enough power from the charger. However, phones do not need a certain amps to be powered by the charger. So I want to know if I can use any changer that has 5 volts, but varying amps. This is because I read that if you use a charger with lower amps it is better for the battery as it is not charging as fast increasing the life span of the battery, is this true?
Example: I have a LG G2 which uses a charger with 5V and 1.8A , but I want to use my nexus wireless charger that is 5V and 1.2A
Thanks for any assistance!

[Q] Is it safe to use higher mAh chargers?

Hi guys,
My LG G3 has uses a charger that outputs 5v 1.5mAh
I have a USB charger here that outputs 5v 2.1mAh (used for my GoPRO highcap batteries)
I've been using this 2.1mAh charger for my LG G3 and everything works great. But I'm beginning to worry if this is damaging my batteries or phone in anyway?
and to push this question further, is it safe to use even higher mAh? i have a 3mAh usb charger here as well but im afraid to use em.
Thanks
BrownChiLD03 said:
Hi guys,
My LG G3 has uses a charger that outputs 5v 1.5mAh
I have a USB charger here that outputs 5v 2.1mAh (used for my GoPRO highcap batteries)
I've been using this 2.1mAh charger for my LG G3 and everything works great. But I'm beginning to worry if this is damaging my batteries or phone in anyway?
and to push this question further, is it safe to use even higher mAh? i have a 3mAh usb charger here as well but im afraid to use em.
Thanks
Click to expand...
Click to collapse
As far as I know, current is drawn from the device, not pushed from the charger.
Almost all modern devices limit the amount of current they can draw from the power supply in order to protect the battery and the inner circuits. The amperage of the charger just tells you how much current it is able to supply, not how much current it will supply to the device it is connected to.
If you plug a 2.1A charger to a phone that limits the amount of current at 1.5A, it will charge at 1.5A.
If your phone has an amperage limit (which is most likely the case), then you're fine.
Adrianrff said:
As far as I know, current is drawn from the device, not pushed from the charger.
Almost all modern devices limit the amount of current they can draw from the power supply in order to protect the battery and the inner circuits. The amperage of the charger just tells you how much current it is able to supply, not how much current it will supply to the device it is connected to.
If you plug a 2.1A charger to a phone that limits the amount of current at 1.5A, it will charge at 1.5A.
If your phone has an amperage limit (which is most likely the case), then you're fine.
Click to expand...
Click to collapse
ONe of the main reasons I wanted to use a 2.1A charger is because LG's wireless charger keeps getting "slow charging" notice.. i theorized that perhaps the "wireless range" could be increased if i used a higher amp charger.. does this make any sense?
Although I have noticed much lesser "Slow Charging" warnings now..
BrownChiLD03 said:
ONe of the main reasons I wanted to use a 2.1A charger is because LG's wireless charger keeps getting "slow charging" notice.. i theorized that perhaps the "wireless range" could be increased if i used a higher amp charger.. does this make any sense?
Although I have noticed much lesser "Slow Charging" warnings now..
Click to expand...
Click to collapse
I'm not sure I understand what you're saying here, you threw me off when you talked about wireless charging. Were you talking about plugging the 2.1A charger to the charging pad or plugging it directly into your phone? Either way, it all comes down to the maximum amperage a given device will let through.
If you meant plugging the higher amperage charger to the charging pad, the result will be the same, as it is very likely that the pad also has current limiting mechanism. If the current flowing through the charging pad coils is set at a maximum value, then the magnetic field created by the coil and the current induced by this magnetic field inside the phone will also be set at a maximum value, thus charging the battery at the same rate, regardless of the wire charger output (unless, of course, the charger can handle less amps than the pad [or the phone], in that case it will charge slower).
I don't really know why you're getting the "slow charging" warning, I've never used wireless charging before, but i do know that the position of the phone in relation to the pad is very important, because the strenght of a magnetic field decays strongly with distance.
I see. Wow thanks for the knowledge share.
BTW, sorry for the confusion, I actually meant both. I have a wireless charging dock that gets the "SLOW CHARGING" warning frequently w/ the original cable and charger.
So I replaced that cable w/ the 2.1mAh w/c I use for the wireless charger most of the time, but occasionally plug the usb cable from the wireless charging dock directly into the phone (for an even faster charging = when I'm in a hurry)
BrownChiLD03 said:
I see. Wow thanks for the knowledge share.
BTW, sorry for the confusion, I actually meant both. I have a wireless charging dock that gets the "SLOW CHARGING" warning frequently w/ the original cable and charger.
So I replaced that cable w/ the 2.1mAh w/c I use for the wireless charger most of the time, but occasionally plug the usb cable from the wireless charging dock directly into the phone (for an even faster charging = when I'm in a hurry)
Click to expand...
Click to collapse
Do you notice any difference when charging directly with the 2.1mA cable and the original? There shouldn't be any, unless the original is rated at a lower amperage than what your phone draws, which doesn't make much sense.

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