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5-Port 40W/8A QC 3.0 Quick Charge USB Wall Charger - $11.99 AC + FS

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Last Edited by robp June 19, 2018 at 10:18 AM
price is $9.99 with code C5KI6XQS

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#3
Only a single port has QC
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#4
Correct me if I'm wrong. 8A is not sufficient enough to charge all 5 devices simultaneously.
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#5
Does anyone have any experience with this? Wondering if this unit makes any loud noises or buzz
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#6
Weak sauce. 40W with a QC 3.0 port? LOL.

Avoid this junk.
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#7
Quote from xevoxrsx
:
Only a single port has QC
QC shouldn't be used all the time. It will drastically shorten your batteries life.
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#8
Quote from firelikeiya
:
QC shouldn't be used all the time. It will drastically shorten your batteries life.
Not true. That's a common misconception about variable voltage+amperage charging. In proper use, it will increase the batteries longevity. Variable voltage chargers are designed to increase and decrease voltage and amperage depending on resistance. The lower the resistance, the higher wattage the charge. This also means greater efficiency in charge with less waste(heat) per watt. Even overnight charging is safer on variable voltage chargers, though still far from ideal.
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#9
Quote from ilikemoneys
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Not true. That's a common misconception about variable voltage+amperage charging. In proper use, it will increase the batteries longevity. Variable voltage chargers are designed to increase and decrease voltage and amperage depending on resistance. The lower the resistance, the higher wattage the charge. This also means greater efficiency in charge with less waste(heat) per watt. Even overnight charging is safer on variable voltage chargers, though still far from ideal.

No way, QC definitely makes the battery run hotter. What they are doing is attempting to minimize this by stepping the voltage and current but you are still charging the battery at a faster rate which creates heat.
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Last edited by firelikeiya June 16, 2018 at 10:39 AM.

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#10
Quote from firelikeiya
:
No way, QC definitely makes the battery run hotter. What they are doing is attempting to minimize this by stepping the voltage and current but you are still charging the battery at a faster rate which creates heat.
Again, you still don't quite understand how it works. Yes, while charging the battery, due often but not exclusively to higher current, there will be, in total, more heat generated as waste from electron transfer. However, one, it's noticeably more efficient than standard charging, and, two, there will be less time spent at the higher temperature as well as lower resistance partly due to the increased temperature. You also seemed to miss my statement on proper use. Variable voltage/amperage chargers are intended to reduce the depth of discharge by keeping the battery within optimal levels(~20% to ~80%) by regularly utilizing short charging intervals throughout the day as opposed to overnight charging, charging to 100%, or just in general charging when the battery is in a sub-optimal state. Also, all batteries must heat to charge. Resistance lowers as temperature increases. For lithium ion batteries, prolonged exposure to heat is typically more damaging than short exposure to higher heat. With phones in particular, the standard 5v 2a charge still increases battery temperature above the 30`C threshold that is considered stressful. Generating 10`C to 12`C more for a quarter of the time, 5`C to 6`C more for a quarter of the time, and 2`C to 3`C less about half the time during a full charge cycle actually means less time spent at an elevated temperature. One other thing to consider is that the heat you feel on the device is not indicative of the battery's temperature. There is a lot of loss even before the battery gets any of the charge.
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#11
Quote from ilikemoneys
:
Again, you still don't quite understand how it works. Yes, while charging the battery, due often but not exclusively to higher current, there will be, in total, more heat generated as waste from electron transfer. However, one, it's noticeably more efficient than standard charging, and, two, there will be less time spent at the higher temperature as well as lower resistance partly due to the increased temperature. You also seemed to miss my statement on proper use. Variable voltage/amperage chargers are intended to reduce the depth of discharge by keeping the battery within optimal levels(~20% to ~80%) by regularly utilizing short charging intervals throughout the day as opposed to overnight charging, charging to 100%, or just in general charging when the battery is in a sub-optimal state. Also, all batteries must heat to charge. Resistance lowers as temperature increases. For lithium ion batteries, prolonged exposure to heat is typically more damaging than short exposure to higher heat. With phones in particular, the standard 5v 2a charge still increases battery temperature above the 30`C threshold that is considered stressful. Generating 10`C to 12`C more for a quarter of the time, 5`C to 6`C more for a quarter of the time, and 2`C to 3`C less about half the time during a full charge cycle actually means less time spent at an elevated temperature. One other thing to consider is that the heat you feel on the device is not indicative of the battery's temperature. There is a lot of loss even before the battery gets any of the charge.
Is there a way to determine if a QC charger has variable amps set up properly? What do I look for in a quick charger exactly?

And since you're seemingly knowledgeable about this, if I have other non-QC capable items (e.g., speakers, headphones, etc) and plug them into a quick charger (e.g., the one that came with my Galaxy S7) can any harm be caused?
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#12
Quote from leidout
:
Is there a way to determine if a QC charger has variable amps set up properly? What do I look for in a quick charger exactly?

And since you're seemingly knowledgeable about this, if I have other non-QC capable items (e.g., speakers, headphones, etc) and plug them into a quick charger (e.g., the one that came with my Galaxy S7) can any harm be caused?
In backwards order, no harm because the device simply will only accept the charge rates it specifies. There are a ton of different variable voltage charging standards(dash, adaptive fast, QC 1&2&3&4, USB-C PD, etc.) and chargers out there. Without opening the adapter and testing, you can't really say if a charger is good or not without plugging in a device. It still falls back to checking reviews and warranty. An easy thing to do is to also check the standards maker's website for their list of devices. Qualcomm posts a list for Quick Charge, WPC does for Qi wireless charging. I'm sure others do too.
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#13
Quote from ilikemoneys
:
Again, you still don't quite understand how it works. Yes, while charging the battery, due often but not exclusively to higher current, there will be, in total, more heat generated as waste from electron transfer. However, one, it's noticeably more efficient than standard charging, and, two, there will be less time spent at the higher temperature as well as lower resistance partly due to the increased temperature. You also seemed to miss my statement on proper use. Variable voltage/amperage chargers are intended to reduce the depth of discharge by keeping the battery within optimal levels(~20% to ~80%) by regularly utilizing short charging intervals throughout the day as opposed to overnight charging, charging to 100%, or just in general charging when the battery is in a sub-optimal state. Also, all batteries must heat to charge. Resistance lowers as temperature increases. For lithium ion batteries, prolonged exposure to heat is typically more damaging than short exposure to higher heat. With phones in particular, the standard 5v 2a charge still increases battery temperature above the 30`C threshold that is considered stressful. Generating 10`C to 12`C more for a quarter of the time, 5`C to 6`C more for a quarter of the time, and 2`C to 3`C less about half the time during a full charge cycle actually means less time spent at an elevated temperature. One other thing to consider is that the heat you feel on the device is not indicative of the battery's temperature. There is a lot of loss even before the battery gets any of the charge.
But QC raises battery temp above 40`C
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#14
Quote from firelikeiya
:
But QC raises battery temp above 40`C
Correct, but like I said, duration of stress has a much bigger impact than the increased temperature at these levels. At 60`C, sure, that's absolutely not good for the battery and will have a huge impact on cell life. The difference between 40`C and 30`C is offset with variable rate charging as the total time spent above the stress threshold is lowered so the overall impact is generally lower than standard charging. There are differences between the technologies that make some better than others, of course. One Plus's dash charge is pretty terrible on batteries comparatively speaking while Qualcomm's QC 4.0 is technically the best. USB PD would be as well but the standard accounts for such a wide variation of power requirements that it's still needs a little more time.
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#15
I use AccuBattery app but should I use the Qualcomm quick charger that came with the phone or a 5 port charging port that charges a little slower? thk in advance.[

QUOTE=ilikemoneys;116691035]Correct, but like I said, duration of stress has a much bigger impact than the increased temperature at these levels. At 60`C, sure, that's absolutely not good for the battery and will have a huge impact on cell life. The difference between 40`C and 30`C is offset with variable rate charging as the total time spent above the stress threshold is lowered so the overall impact is generally lower than standard charging. There are differences between the technologies that make some better than others, of course. One Plus's dash charge is pretty terrible on batteries comparatively speaking while Qualcomm's QC 4.0 is technically the best. USB PD would be as well but the standard accounts for such a wide variation of power requirements that it's still needs a little more time.[/QUOTE]
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