Hello everyone. I wanted to ask a question concerning charging on a lower voltage. A friend of mine has moved to the USA from Europe. Since the current here is 220V and there it is lower, she uses an adapter. She says that her phone charges quickly, but on the other hand it discharges really fast. I wanted to ask if this is a problem of the adapter, or does the lower current actually can affect the charge/discharge rate. Thank you in advance!
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Hello guys, can anyone tell me if the current of a charger impacts on downtime of the phone(being charged)
Does 1200mAH charges faster than 700mAH?
Thanks in advance
elimix said:
Does 1200mAH charges faster than 700mAH?
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short answer yes
long answer, it's safe to charge using up to 2000 mAh (2 Amp) chargers, i'm using it on a daily basis
however faster chargers will produce more HEAT, and more HEAT usually reduces the life span of the battery faster according to science facts
in real life usage, you wont really notice a difference, because by the time if and when the battery does dies, you're probably already on a new phone
also replacement batteries are quite affordable, even legit ones runs for aprox $30, after market ones are just $2 ~ $5 average
How are you using these chargers? If you're talking about simply plugging your phone in via the USB socket then it makes no difference. The "charger" is in the phone. All you're doing is providing it with 5V and a heck of a lot more current than the phone actually needs or draws to charge the battery.
I'm interested in buying an external battery charger, or a cradle charger, so I can have two batteries going—one always charging outside of the phone—and thus never having to plug my phone in to charge. After a brief eBay search, all of the cheapest ones appear to be the same: you can find the model I'm referring to here.
My concern, however, is with the specifications listed, which read:
Input: AC 100-240V~50/60Hz 0.15A
Output: DC 4.2V~350mA~±50mA
USB: 5.2Vd.c.800mA
The output appears to be 300-400mA, which is slightly lower than a stock charger. As far as I know, this tells me how fast it will charge the battery. Since it will be plugged into the battery charger when I swap batteries (for the full discharge of the other battery), I don't care if it charges slower. However, the voltage appears to be quite low at 4.2V—and I'm entirely unsure how this will affect things. Will it still charge? Can it do damage to the battery? Should I not purchase this unit? What exactly does a lower/higher voltage mean?
Anyone?
Does it work? Is it safe? Does the lower voltage matter?
I've been using this same battery charger for over a year now. It charges my stock and extended battery (3500mAh) without any problem. Yes it does take longer compared to the normal charger to charge your battery because of the low mA but I don't think it has had any affect on my batteries. So the only downside is it takes comparatively longer to charge.
mo_danish said:
I've been using this same battery charger for over a year now. It charges my stock and extended battery (3500mAh) without any problem. Yes it does take longer compared to the normal charger to charge your battery because of the low mA but I don't think it has had any affect on my batteries. So the only downside is it takes comparatively longer to charge.
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Great! That's what I wanted to know. Thanks!
I have this charger as well. I can confirm that I have have not had any problems with the charger sense I got it. I ordered mine from Amazon here:
http://www.amazon.com/2600mAh-Batte...3352199&sr=8-4&keywords=Galaxy+note+batteries
1. For example, if a phone comes with a charger rated at 5V and 0.7A, when it's plugged in to charge, what dictates the current the phone draws, is it the resistance of the phone?
2. If I = V/R, do phones typically provide little resistance so that the current is the max the charger can provide? i.e in the above example, if the phone was off, would it constantly be drawing 0.7A, and if the charger was changed with one rated at 5V and 2A, would the phone draw more than 0.7A? could it reach 2A?
3...bit of a side question, but when the phone is done charging, how does it stop drawing current? again if I = V/R, does the phone have to alter the amount of resistance it is providing? how does it do that?
I'm only looking for fairly simple answers to be honest as this is just a general query and not something I need to go in depth with.
Thanks.
bubu1 said:
I'm only looking for fairly simple answers to be honest as this is just a general query and not something I need to go in depth with.
Thanks.
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Of course, I'm not in the secrets of the companies who build phones, but, as an electronician, I can answer general questions.
First, you have to know that the charger itself has no Idea of size of the battery he has to charge. It is just a regulated source of voltage, with a limitation to a maximum current. The charger limit the voltage at 5V, and, when you ask more amps than what he is supposed to send, It will reduce the Voltage, in order to limit the current to this max value.
It is the phone itself witch regulate the way it charge its battery. It follows complex curves, depending of the way it is programmed, fast charge etc... Of course, if the source limits the current, it will do its best with this max current. For the phone, a 5V unllimited current source is ideal. The fast charge consist to send the max current that the battery is able to afford at the begining of the charge (when empty) then limit progressivaly this current when the battery approach the end of the charge. This is for ION-Lithium batteries. Old Cadmium Nickel, by example, used the "delta peak" method. The battery was feed by a constant current (1A for an 1AH battery) and the voltage was monitored. This voltage increased with the charge, then after a maximum, began to decrease while the chage was at 90%. At this time, the current was reduced to 1/20 in order to never overcharge the battery.
Hello everyone!
I recently purchased a Mi note 5 pro that comes with a 5V,2A charger out of the box.
While using it I realised the phone started warming up while charging with it- The phone reached a temperature of 42 deg C (well, the device got significantly warm).
Concerned, I tried out an old Samsung charger (5V,0.7A) with my Mi device and realised the charging temperature was much less (35 deg C) (here, the device remained cool).
Well, I wanted to know:
- Is it safe to charge the Li-ion battery at low charging currents (voltage is constant at 5V) ?
- Is it okay to use a different manufacturer's charger with my device (even if the charger is a genuine one)?
Also,
-I don't have a problem with longer charging times
-I frequently keep the device plugged in and maintain the charge between 20% and 80% (and full charge cycle once or twice a month)
-I am a heavy user but I avoid using the device while it is plugged in
-AccuBattery was the app I used for battery measurements
In the end I'm just curious to know how to prolong the battery life of my device and I'd really appreciate the help.
Thank you
1. Yes it's absolutely fine to charge at a low charging current. It is in fact better for the battery to charge it at a low current.
2. Yes, it's also absolutely fine to charge with different chargers, the quality of the charger is what is important.
willhemmens said:
1. Yes it's absolutely fine to charge at a low charging current. It is in fact better for the battery to charge it at a low current.
2. Yes, it's also absolutely fine to charge with different chargers, the quality of the charger is what is important.
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Thank you
Hello everybody,
I hope someone can help me out with some physics and electricity knowledge.
I have been charging my surface for some time with a different charger.
The original charger data:
So instead of carrying the original charger with me I have used my phone charger, with these specs:
Of course, it is charging much slower, but it was ok for my purpose.
Recently I have noticed that the battery needs to be charged more often - so it drains more quickly.
Of course, most would say the battery capacity is still OK, but the surface is still pretty new , just a couple of months in usage- only 40+ charging cycles and I have already noticed a battery difference, especially after the last weeks with phone charger
So because the phone charger supplies also 20V I had to aks myself if it'S ok to use it or if it could damage the performance of the battery - and also if this already happend. The original Voltage is 15V max.
Any opinions /experencies on this? would be gratefull, thanks!