03-12-2013, 09:44 AM #1
- 41 Posts
I know there have have been many threads on the battery topic, but i couldnt really found an answer to the follow issue. I recently got a Satechi 2A car charger with an"quick charge" adapter - Satechi ST-2412 Car Lighter USB Charger Adapter with Smart Converter for iPad 2, iPhone 4, Android Phones, Samsung Galaxy Tab, BlackBerry Playbook, HTC Flyer. The adapter is in fact enabling the cable to act as "Charge only", instead of data & charge. The results are quite spectacular - I get a rate of about 10% per 10 minutes of charging. Moreover, i can use Drive+ and stream music over LTE and phone is still charging on positive (charge intake is higher than consumption). However, I'm noticing a decrease in battery life..., dont have exact numbers yet...but just a general feeling. Also, seems that wireless charging is slower than before. I used to be able to charge the phone in about 2 hours. Now, i kept it about 1.5 hours and went from 40% to only 80%.
Any ideas? Should i refrain from using the car charger?..or just keep it to when i really need it.
- 03-12-2013, 09:49 AM #2
I have not looked into it myself, but a friend of mine has told me that 2A charging does decrease battery life.
I do not know the rate at which it deteriorates but if I had to guess, I think it's more likely that you are imagining it and are suffering confirmation bias, or perhaps your battery is of poor quality and would have deteriorated regardless.
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- 03-12-2013, 10:19 AM #3
Yeap, charging at much higher current will cause damage to your battery, hence reducing its life.
Always use the charger that comes with the phone as a reference. In this case, Lumia 920's wall charger will have the output of 1 A. Therefore, using 2 A will cause the battery to overheat. So my suggestion is not to use the car charger, unless it's at 1 A or lower.
Well.. unless you are in a very very emergency situation, it's ok to use it.
03-12-2013, 01:21 PM #4
- 390 Posts
As the phone manages the charge rate, not the charger, it is impossible for the phone to charge out of spec whatever rating the charger is.
Secondary to this, the peak charge rate for Li-Ion is typically 2C, which for a 2.1Ah battery, would be a charge rate of 4A. Which a 2A charger will never provide. So whichever way you look at it, you're not going to charge it 'too fast'.
- 03-12-2013, 02:18 PM #5
- 03-12-2013, 03:34 PM #7
NiMH Vs. Lithium Rechargeable Batteries | eHow.com . the general principle is still the same though.
- 03-12-2013, 03:38 PM #8
Anytime you up the charge rate you are putting extra stress on the battery. It is also good to make sure the battery is not kept at a full charge constantly. The battery needs to drain and recharge some to stay in tip top shape.
03-12-2013, 07:41 PM #10
- 194 Posts
Whenever I have an issue with a charger (some chargers stop touch screens from responding correctly) I insert my Nokia DC-16 Portable Battery
once Its fully charged It'll charge my phone , the great thing about it is when I get off the car I could still continue my charging cycle (Improves battery life actually to do so) and its super fast at charging too (Even faster than my wall charger or my Wless charger)
- 03-12-2013, 11:57 PM #11
If the phone manage the charge rate, not the charger, then how come if you charge using the wall charger, the battery will fully charge faster than if you charge using the USB port from your computer?
The charger that comes with the phone charge with output current of 1 A, while charging using the standard USB 2.0 port will give the output of 500 mA (if none other devices are connected to the other USB port)
And even the Nokia DC 16 portable battery has the output of 950 mA.
This can be easily proven by doing the testing. If you use the wall charger of 1 A compared it with the charger that output 2 A, the one with 2 A will definitely cause the phone to heat up more. And in the long term it will reduce the battery life.
And this has been proven by my college friends who did this kind of battery testing. Not only that, in a real world example, people in my country like to use the power bank, that charge the battery at 2 A. And all of them complained that their battery life do not last as long as it used to.
- 03-13-2013, 12:13 AM #12
For storage of the Lithium based battery, it is true. The battery must not be fully charged, charge it at around 40 % if the battery is going to be stored for quite some time.
However, it does not need to be drain and recharge often. Lithium does not have "memory effect". The purpose is just to calibrate the battery reading for the OS to read. As draining the Lithium-based battery, will also put too much stress on the battery. The best practice is too charge whenever you can. We don't need to wait until battery reach low level to charge.
Draining and Recharging is only useful for NiMH battery as that type of battery has "memory effect". It needs to be drained completely to know where is the low level and then fully charge it to know the top level.
- 03-13-2013, 12:44 AM #13
A computer USB port only supports up to 500mA, so even if the phone is asking for 1A it's only gonna get 500mA....
That aside, this is a pretty basic principle: a circuit will draw as many Amps as it needs. The phone *can't not* determine the charging rate: that's how electricity works. On a charger, the Amp value is really denoting potential maximum, not at what rate electricity will flow. For example, if a charger is rated for say, 30A, you can safely plug your phone into it and your phone will only draw 1A or 2A.
So the moral of the story is: if modern phones support 2A charging and that decreases battery life, then the *best* way to take care of your battery is to charge it by your computer only, where the maximum output is 500mA.
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- 03-13-2013, 03:34 AM #14
In USB 3.0, on the Battery Charging Specification, the port can actually handle up to 5 A, but right now the specification limits the current drawn to 1.5 A
And, yes, it's a pretty basic principle that the load will draw as many current as it needs. But in this case, between the battery and the charger, there are many circuitry in between that will regulate it. So the battery will not just simply draw the current that it needs.
However, I need to disagree on the part where you can safely use a charger that has 30 A output to charge your phone. It will definitely damage your phone.
When the charger is rated at 1 A, it is meant to deliver 1 A maximum (assuming 100 % efficiency). It doesn't depend on the load or the battery to draw how many currents.
At First Stage of Charging, it will supply the maximum current. After it reaches around 70-80 %, then the charger itself with reduce the charging current until it reaches 100 % (2nd stage of Charging). Then the charging will stop.
And I think the best way is to use the wall charger that comes with the phone or some other charger that can charge the battery with the same current as the wall charger specified. And of course, your suggestion, to charge at 500 mA is the best way to prolong the battery life. As charging with lower current will make the battery last longer, however, I think 500 mA is just not convenient. It takes too long to recharge.
- 03-13-2013, 07:29 AM #15
USB 3 can charge device rapidly given special software, actually. I have a hub that supports rapid charging, but it only turns on for iDevices I think. This is mostly irrelevant because for 99.9% of all scenarios the draw will be 500mA unless the user is able to manually change it.
"But in this case, between the battery and the charger, there are many circuitry in between that will regulate it. So the battery will not just simply draw the current that it needs."
The battery doesn't know what it needs, if you hooked it straight to a power source I suspect it would just draw the maximum amount of Amps available. The circuitry is what determines what the draw is and it has been designed to use a designated amount of Amps. So those "many circuitry" between the battery and the power source ARE what regulate what the battery needs. This applies to nearly anything with a battery. Engineers aren't stupid.
And no, you are simply wrong. If something is rated 1A, it will deliver 1A if requested of it but it will not just pump 1A into anything- *this is not how electricity works*. You're confusing Volts and Amps.
As far as 500mA being inconvenient- most people leave their phone to charge overnight. Doesn't matter how slow 500mA is then.
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- 03-13-2013, 09:29 AM #16
Isn't that what I said earlier?
I did not say that it will pump out 1 A into anything. I said it is meant to deliver 1 A of maximum current. Which means, when the circuitry in the charger detects that the battery is in low level (by monitoring the voltage level), it will supply the maximum current it can supply to the battery. Until it detects the battery has reached 70-80% level, then it will slowly reducing the current it supplies to the battery (2nd stage of charging).
Sorry OP for out of topic a bit
Hope the explanation from us can be helpful :D
- 03-13-2013, 10:02 AM #17
You're contradicting yourself...
If the phone determines the rate
Then the phone determines the charging rate to charge the battery with.
The maximum Amperage will be drawn by the phone
Connected to a 30A charger, it will draw 2A. It will never draw more than it is designed to. It can't.
The charger CANNOT "supply the maximum current" electricity simply does not work that way.
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- 03-13-2013, 10:30 AM #18
What makes you think that the charger cannot supply the maximum current?
Just try it yourself,
Plug in 1 A wall charger to your phone, and compare it with the 2 A charger and 500 mA USB 2.0 charging and see which one charge faster.
03-13-2013, 11:32 AM #20
- 94 Posts
I think using a 2A charger won't have any difference compared to the 1A nokia charger. sure the charger can deliver 2 amps, but the phone is probably configured to only take 1 amp. i'm pretty sure the phone will not take any advantage of 2A charger
- 03-13-2013, 03:58 PM #21
- 03-13-2013, 03:59 PM #22
- 03-13-2013, 04:08 PM #23
- 03-13-2013, 07:12 PM #24
But just to enlighten you, voltage in your house can change. For example, if you're in America, the standard household voltage will be 120 V, but if you use a lot of high power devices, the voltage will drop. So it won't always be 120 V. Unless you install a Voltage Regulator in your house, then it will maintain the voltage at 120 V.
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