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So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?
Benny_L said:
So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?
Click to expand...
Click to collapse
You've pretty much answer your own question!
The current supplied by a charger/USB port determines how fast it can charge the battery, which is why the wall charger (1amp) charges much faster than a PC USB port (0.5 amps).
Regards,
Dave
It's almost completely logical.. say you have a 1.5A battery (1500mA) and a 500mAh charger (ie USB) then it will take 3 hours for it to charge but with a 1000mAh charger it will take an hour and a half.
Can't really explain it more than that, so hth.
Well , Yes and No
This is only partly true ......
If you charge it on the PC , max output is 0.5 amps , and data is possible while charging .
Now with Desktop and car charger , the amp can be anything the manufacturer likes but you have to keep the following in mind :
USB Specs state the following :
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In Battery Charging Specification,[32] new powering modes are added to the USB specification. A host or hub Charging Downstream Port can supply a maximum of 1.5 A when communicating at low-bandwidth or full-bandwidth, a maximum of 900 mA when communicating at high-bandwidth, and as much current as the connector will safely handle when no communication is taking place; USB 2.0 standard-A connectors are rated at 1500 mA by default. A Dedicated Charging Port can supply a maximum of 1.8 A of current at 5.25 V. A portable device can draw up to 1.8 A from a Dedicated Charging Port. The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured. The increased current (faster, 9 W charging) will occur once both the host/hub and devices support the new charging specification.
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So if your Desire ( Yes , the Desire supports these specs ) detects the short , it will switch to fast charging mode otherwise it will limit the charging current .
Unfortunately , there's no way to know , just by looking at a charger, if it respects the specs or is just a low cost 5V powersupply . I've encountered quite a few ( mostly lowcost) desktop and car chargers that are rated between 1 and 2 amps , but still take bl**dy ages to charge the phone . Checking those with a measuring tool , you usually see the data pins are "Not Connected" instead of being shortened :-(((
Final Word .... don't try to save some money on a cheap charger , you'll regret it Genuine HTC works great , others do the same , but don't expect a $1 charger from Hongkong or whereever to do it !
These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
-----------------------------------
- Sent via my HTC Desire -
th3 said:
These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
-----------------------------------
- Sent via my HTC Desire -
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Click to collapse
Ya, I noticed the charge slows down considerably for the final 10-15 %
I find myself charging my Desire more than I actually use it, lol.
I found now the answer to this problem: I use a Nokia charger (5v and 890 mA) with a microusb adapter. You can find one on eBay at ~2$
Now it takes about 2 hours from 20% to 100%
Lets hope nothing wrong happens to my precious Desire
look here for a method to charge at ac speed from usb, explains a few things too.
Is this the highest?
http://www.seidioonline.com/product-p/pmc.htm
Post links if you know of higher ones, thank you.
Sent from my ADR6400L using XDA App
There are 2.1A usb adapters, but I don't think microUSB can take advantage of it. The one you linked is a 1A, which is the same as the wall charger HTC gave with the phone. I'm currently using a 1A usb adapter in my truck.
Ok that's probably what I'm looking for then. Are there wall chargers greater than what came with the phone that I can take advantage of?
Your best bet would be to try the USB adapters made for iPads. The Apple products can utilize the 2.1A chargers with their sync cables, but I'm not sure if a microUSB cable can though. I have some 2.1A wallchargers from some of my Apple products, I'll test them later and let you know what I find out.
http://www.verizonwireless.com/b2c/...ryDetails&archetypeId=12299&accessoryId=46370
I just got an Enercell from Radio Shack with dual usbs. Max output is 2.5A divided between the two ports.
http://www.radioshack.com/product/index.jsp?productId=11329448
on sale now for only $14.99. Seems to be of good quality.
The Motorola rapid chargers rock.
Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
Most adapters on the market spec more than that, they're usually 500 mA or above. And again, unless you boost the volts, you're not going to be able to push more than 350 mA or so.
So don't waste you're money.
On the other hand, if your going to share a car outlet with another device like mp3 or ipod, then yeah, you'll need a higher output, two port, adapter.
Edit: It just occurred to me that if you're using the phone heavily while charging, then yeah you may need more than 500 mA. My currrent widget shows the phone can draw another 250 mA or so during use. That plus the charge totals to around 600 mA. But depending upon design, the phone may not be able to pull in all 600 mA. A test with a current meter would be real interesting.
The charger shipped with the Thunderbolt is a 1 Amp charger.
If I use a 500 mA charger the Current Widget shows a +450mA charge current. However if I use the 1A charger, I get a charge current of about +850mA.
Given that the google navigation gobbles over 400mA when running, you need a car charger with greater than 500mA capacity of you want the phone to charge at the same time.
Sent from my ADR6400L using XDA App
boingboingbilly said:
The Motorola rapid chargers rock.
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Click to collapse
Good to hear, I ordered one today for $11 on ebay. I had heard other people say they liked that one too.
Ecomaniac said:
Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
Click to expand...
Click to collapse
You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
A Li-Ion battery charging process consists of three stages:
· Slow Charge: Pre-charging stage using current of 0.1C
· Fast Charge: Constant current charging stage using current of 1C
· Constant voltage charging stage
During the slow charge stage, the battery is charged with a constant low charge current of 0.1C, if the battery voltage is below 2.5V. The slow charge stage is rarely used during the charging process of a Li-Ion battery.
The fast charge (constant current) and constant voltage charging are the most important stages during a recharge process. Most Li-Ion batteries have a fully charged voltage of 4.1 or 4.2V.
The battery is first charged with a constant current of 1C until a battery voltage reaches 4.1 or 4.2V. The firmware continuously checks the charging current by sensing the voltage at the current sense resistor (Rsense) and
adjusts the duty cycle of PWM output from the MCU. The battery's voltage is checked frequently.
Whenever found the battery's voltage reaches 4.1 or 4.2V, the charger will switch to constant voltage charging mode. The battery is then charged with a constant voltage source at a fixed battery voltage of 4.1 or 4.2 V...When the charging current falls below 0.1C, the charging process must stop.
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Click to collapse
Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else
mike.s said:
You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
Click to expand...
Click to collapse
very useful, thanks!
walbuls said:
Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else
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Click to collapse
I second monoprice.
I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.
eccenpix said:
I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.
Click to expand...
Click to collapse
I suspect you need to find one which properly follows the USB Battery Charging Specification. That link is to the most recent version, which came out on 7Dec2010 (remember Pearl Harbor!). Version 1.1 is easier - a Dedicated Charging Port is indicated by shorting together the data lines (the two middle conductors on a full sized USB connector. By doing so, it indicates the device may try to draw up to 1.8 A of current (although a dedicated charging port is allowed to limit the current to less than that, it must provide at least 1.5 A).
I bought a cheap USB hub with 5 ports, used an exacto knife to cut the traces going to the data lines (the middle two) on all the ports, and then shorted them together on each port. It's now no longer a USB hub, but a USB charger with 5 ports I can used to charge stuff (phone and Bluetooth, quite often). The AC adapter which it came with does 2 Amps. My Thunderbolt says "Charging (AC)" when plugged into it.
So, if you can open up one of your adapters, just solder a jumper between the middle two contacts (make sure they're not connected to anything else).
Just got the Rocketfish premium microUSB at Best Buy and it has a captive coiled cord and a USB port. TBolt says "AC plugged" and reads +670 mA.
Good choice on the Motorola Rapid Charge - I've burned through 3 other cheap car chargers trying to keep my phone alive while using Google Nav and this is the first one to work!
i have the rapid motorola one on amazon
lippstuh said:
i have the rapid motorola one on amazon
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+1 Works great! Battery widget usually shows about +800mA while only charging. Real close to the wall charger
Anybody come across a car charger that is high current like the HTC wall charger?
Most car chargers are classified as "rapid".
Anything designed to charge an iPad (2.1A versus the typical 1A) will give you plenty of juice. I use the Scosche reVIVE II with Pandora, Bluetooth, and GPS Navigation all on and still have enough power to positively charge my battery.
Fair warning, though, this will cause the phone to get real hot (I've had the overheating warning lights flash twice so far), so make sure you have plenty of ventilation around the phone, keep it out of the sun, etc etc.
Any charger that is at least 1 amp. will do. The phone 'pulls' a max of around 0.85 amps. No need for more then 1 amp.
If it has a replaceable cable, it must be the heaviest gauge, shortest cable, that you can use. I have seen long cheap thin cables that drop over a volt, and the Thunderbolt charges really slowly.
The charger or cable have to state that they for rapid charging. To rapid charge, you need to have the USB D- and D+ lines shorted. If that are not shorted, the Thunderbolt limits the charge current to around 0.35 amps. thinking it is connected to a PC. If they are shorted, letting the Thunderbolt know it can be rapid charged, you get up there around 0.85. You can easily modify the charger for high rate if it is good for at least an amp.
And in the end is heat. Heat and lots of it. It will damage the battery. So put it out of the sun and in cool air like near a vent.
Motorola Rapid Charger on Amazon is the best. I bought two.
http://www.amazon.com/Motorola-Vehi...Q9CA/ref=sr_1_1?ie=UTF8&qid=1309959388&sr=8-1
Review off Amazon
Genuine Motorola charger in retail packaging. 4.75-5.25V 950mA output, works w/ most micro-USB phones like Incredible, etc., June 11, 2010
By
David Pearlman "sound fanatic" (Arlington, MA) - See all my reviews
(TOP 500 REVIEWER) (VINE VOICE) (REAL NAME)
Amazon Verified Purchase(What's this?)
There are so many sketchy sellers selling phone chargers out there, that it can be a bit scary. The problem is that if the charger is poorly made, the output of the charger can be out of spec and can, in some cases, fry the phone you connect to it.
For that reason, when it comes to phone chargers, you should stick to name brands. (They are all made in China, but the name brand ones are usually subject to stricter QA).
When I found this charger on Amazon, SOLD BY AMAZON, I jumped on it. It's a MICRO USB car charger, made for Motorola and sold under the Motorola name, in retail packaging. The rated output is 4.75-5.25V and 950mA.
This charger should work fine with most any phone that uses the MICRO USB connector. The key number to pay attention to is the second one, the rated amperage. This is the MAXIMUM amount of current that the phone can request from the charger. A typical USB port on a PC provides as little as 100mA, and few provide more than 500mA. So this charger should charge your phone faster than when it's connected to a PC. A few phones out now can use up to 1000mA. But that just means they CAN use that amount. If 950mA is provided, they'll still charge, just a bit more slowly.
Note that the amperage (second number) merely tells you how much the charger CAN supply, if requested. The phone itself is responsible for asking for the current. That is to say, if this charger can provide 950mA, but your phone can only use 300mA--no problem. Your phone asks for 300mA and the charger provides all of what is requested. If, on the other hand, your phone can use 1000mA, this charger will provide all it can, which is 950mA--a wee bit less than the max asked for. That's also not a problem; it just means your phone will charge a little bit (not much in this case) more slowly. The rated voltage for this charger is presented in a range of 4.75-5.25V. The "ideal" voltage for a USB charger of any type if 5V. And most chargers for home use are rated right at 5V. But car chargers work in a noisier environment and thus you have the range. This is where a cheapo charger can really do damage, as some of them are poorly regulated and can provide voltages that are WAY out of spec. Again, when you can get a name brand charger from a seller you can trust (Amazon) for such a reasonable price, it's very foolish to consider the cheapo no-names.
This is an excellent quality name brand travel micro USB charger at a price that beats the no-name junk from third party sellers. What's not to like?
BE SURE TO ORDER IT FROM AMAZON AND NOT ONE OF THE THIRD PARTY SELLERS, as some of those have been known to make mistakes with respect to what they ship relative to the listing. I can confirm that Amazon is shipping the P513 /89143N charger, as pictured.
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Click to collapse
ddgarcia05 said:
Motorola Rapid Charger on Amazon is the best. I bought two.
http://www.amazon.com/Motorola-Vehi...Q9CA/ref=sr_1_1?ie=UTF8&qid=1309959388&sr=8-1
Review off Amazon
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I've been contemplating buying this one, but I'd like to ask you if it charges your battery with navigation+music going? I have a usb charger in my truck, and with both of those going it just manages to keep my battery level where its at, sometimes losing a % or two.
kr0n1c said:
I've been contemplating buying this one, but I'd like to ask you if it charges your battery with navigation+music going? I have a usb charger in my truck, and with both of those going it just manages to keep my battery level where its at, sometimes losing a % or two.
Click to expand...
Click to collapse
From what I've read in the past here on XDA and on the reviews for the charger (on amazon) you shouldn't have a problem. The second review for the charger on amazon states that the reviewer was looking for a charger which actually charged his phone will using GPS and that he found it. It's a very well built charger and cheap. It's made my Motorola and sold by Amazon so buy with confidence.
kr0n1c said:
I've been contemplating buying this one, but I'd like to ask you if it charges your battery with navigation+music going? I have a usb charger in my truck, and with both of those going it just manages to keep my battery level where its at, sometimes losing a % or two.
Click to expand...
Click to collapse
It does indeed charge. I've had it since my original Droid and was concerned when I updated to the TB but it will charge the TB no matter what you're doing (I've had Nav running while on a phone call with BT and searching the internet and it still showed it was charging). Just be prepared for your phone to get HOT!! Great charger.
worwig said:
Any charger that is at least 1 amp. will do. The phone 'pulls' a max of around 0.85 amps. No need for more then 1 amp.
Click to expand...
Click to collapse
Actually, the phone will pull more than 850 mA. You're probably basing that on using a battery monitor, which only shows the flow of current into/out of the battery. I've seen 800 mA into the battery at the same time I have display, GPS and a phone call going, which is definitely more than an additional 50 mA. It wouldn't surprise me if the phone can take advantage of something more than 1A, since I see a battery drain of more than 200 mA with all of that going when not on the charger.
kr0n1c said:
I've been contemplating buying this one, but I'd like to ask you if it charges your battery with navigation+music going? I have a usb charger in my truck, and with both of those going it just manages to keep my battery level where its at, sometimes losing a % or two.
Click to expand...
Click to collapse
I have that Motorola charger and am a heavy GPS user. It charges the battery as if it were plugged into the wall. You'll be very satisfied.
mike.s said:
Actually, the phone will pull more than 850 mA. You're probably basing that on using a battery monitor, which only shows the flow of current into/out of the battery. I've seen 800 mA into the battery at the same time I have display, GPS and a phone call going, which is definitely more than an additional 50 mA. It wouldn't surprise me if the phone can take advantage of something more than 1A, since I see a battery drain of more than 200 mA with all of that going when not on the charger.
Click to expand...
Click to collapse
No, that was measured at the 5 volt power supply, based upon a lab power supply. I did a lot of experimenting when I developed the charger and phone mount for my motorcycle. And to get the 850ma from the power supply, I used a very short, maybe 8 inch, USB cable, and a charge voltage close to 5.3 volts. With 5 volts at the power supply, it would only pull about 650ma from the power supply. That was due to the voltage drop in the USB cable. With the 5.3 volts at the power supply, I was getting close to an actual 5 volts at the Thunderbolt. I never measured the current at the battery, but I could see it being a bit more then the 850ma in, if there were a switch mode supply in there.
Though I like the Battery Monitor widget as a rough guide, I never tested to see if the battery current and the battery monitor are accurate.
Does anyone know if the included HTC ac adapter and cable will charge faster than using your pc with the included USB cable?
happimeal said:
Does anyone know if the included HTC ac adapter and cable will charge faster than using your pc with the included USB cable?
Click to expand...
Click to collapse
Absolutely.
A PC USB port is limited to under 500ma. The Thunderbolt appears to to limit PC USB draw to about 350ma. I haven't measured the actual current in the HTC charger, but it is a high current charger, and charges my Thunderbolt very quickly. Battery Monitor widget shows high battery charge rates. I suspect it is getting near the max rate up near 1 amp.
worwig said:
Absolutely.
A PC USB port is limited to under 500ma. The Thunderbolt appears to to limit PC USB draw to about 350ma. I haven't measured the actual current in the HTC charger, but it is a high current charger, and charges my Thunderbolt very quickly. Battery Monitor widget shows high battery charge rates. I suspect it is getting near the max rate up near 1 amp.
Click to expand...
Click to collapse
HTC charger states 5V/1A on the charger itself.
You can use the Palm car charger for $3.75+tax, free shipping. it is 5V/1A, same rating as the HTC wall charger.
Go here for 25% off
http://www.wireless.att.com/cell-ph...otion/accessories.jsp?source=EC0A0011600jtl10
Add product here, must add to cart to see 25% discount.
http://www.wireless.att.com/cell-ph...027&q_sku=sku4720234&q_manufacturer=&q_model=
Also, if so inclined, you can lop the top off of the charger so that you can use any usb cable (ipod, iphone, anything)
dpham00 said:
HTC charger states 5V/1A on the charger itself.
Click to expand...
Click to collapse
That doesn't mean much. That is the MAX the charger can output. The amount that the Thunderbolt will pull varies. If it thinks it is plugged into a USB, it will be less then 500ma. even if the charger is capable of 10 amps.
worwig said:
That doesn't mean much. That is the MAX the charger can output. The amount that the Thunderbolt will pull varies. If it thinks it is plugged into a USB, it will be less then 500ma. even if the charger is capable of 10 amps.
Click to expand...
Click to collapse
i have used the Palm car charger, checking with bmw, it shows around 850ma, same as on my htc charger.
worwig said:
Any charger that is at least 1 amp. will do. The phone 'pulls' a max of around 0.85 amps. No need for more then 1 amp.
If it has a replaceable cable, it must be the heaviest gauge, shortest cable, that you can use. I have seen long cheap thin cables that drop over a volt, and the Thunderbolt charges really slowly.
The charger or cable have to state that they for rapid charging. To rapid charge, you need to have the USB D- and D+ lines shorted. If that are not shorted, the Thunderbolt limits the charge current to around 0.35 amps. thinking it is connected to a PC. If they are shorted, letting the Thunderbolt know it can be rapid charged, you get up there around 0.85. You can easily modify the charger for high rate if it is good for at least an amp.
And in the end is heat. Heat and lots of it. It will damage the battery. So put it out of the sun and in cool air like near a vent.
Click to expand...
Click to collapse
um, i am aware that any charger that will do 1A will do. that was my question, what car charger will do 1A. Alot of times, they dont have that info listed on pages that are selling them.
and the whole thing about the D- and D+ shorted together, i do not believe. the HTC cable that came with the phone does rapid charging and i use it for data all the time too. if they D- and D+ was shorted, i would not be able to use it for data transfer. not unless the HTC charger shorts them internally inside the charger.
leoingle said:
unless the HTC charger shorts them internally inside the charger.
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Click to collapse
Bingo!!
leoingle said:
um, i am aware that any charger that will do 1A will do. that was my question, what car charger will do 1A. Alot of times, they dont have that info listed on pages that are selling them.
and the whole thing about the D- and D+ shorted together, i do not believe. the HTC cable that came with the phone does rapid charging and i use it for data all the time too. if they D- and D+ was shorted, i would not be able to use it for data transfer. not unless the HTC charger shorts them internally inside the charger.
Click to expand...
Click to collapse
Yes, it is hard to find the current info online or even on the package sometimes.
Yes, it is shorted in the charger. I have seen it done in the cable and the cable can't be used for data of course. Not sure why anyone would do that, but they do.
Hello all,
I am trying to figure out which is the fastest charger, wired or wireless for the Nexus 5. To do this, I suggest we gather measurements about the charging speed for the phone charging when it has less than 75% charge.
My results are the following so far:
T-Mobile dual usb wall charger 700-800 mA
this ebay Qi charger [1] 200-300 mA
[1] http://www.ebay.com/itm/Wireless-Qi...l_Phone_PDA_Chargers&var=&hash=item51b121c146
Note that the T-mobile dual USB charger was the power source when using the Qi charger and the same microUSB cable was used in both cases.
Does anybody have a wired or wireless charger that can charge faster?
Also, I am using the Elixir 2 app to measure the mA, is there an alternative that does not require the screen on (I feel that it may affect the measurements)?
The one that outputs more mah will charge faster.
Sent from my Nexus 5 using Tapatalk
They're both awful outputs u need at least 1000 mA / 1A output. You can damage the battery with underpowered charge rates
Also that eBay link states 1A output in the description
Sent from my Nexus 5 using Tapatalk
Guys, for the wired chargers, we are not talking about the STATED MAXIMUM OUTPUT here, we are talking about the output IN PRACTICE. Most chargers are rated for instantaneous output (it can output 1A or 2A or whatever is listed on the charger, but only for a millisecond, then the rate will fall off).
Please use the app and let me know what your rates for wired charging are (not that the rates fall off when the device is charged more than 75%, so try to test when the charge is lower than that). I bet the rate you find will be lower than 800mA, but if this is not the case, I am curous on the charger and cable that you use.
As for the wireless charger, I know it is very very bad, am trying to return it.
A poor/cheap usb cable will make a massive difference too. I once had a cable that wouldn't let more than 384mA through it!
Sent from my Nexus 5 using Tapatalk
Exactly! This is why I picked the cable I am using now, but I could not get over 900mA with this combination of cable + charger. The Charger is a T-mobile dual USB 3A charger and in my opinion it is very good.
The stock wired charger is rated for 1.2A and actually charges at just over 1 A. The charging chipset in the phone limits charging to 1.5 A max.
The nexus wireless charger charges at 750 mA max. Bad positioning and cases will reduce wireless charging efficiency though.
http://www.anandtech.com/show/7517/google-nexus-5-review/3
I've noticed that during wireless charging my phone will charge at 500-600mA up until 85-87% and after that it will charge at 300mA to 100%, so make sure when you are testing to test at lower battery capacity. Also, try wireless charging from a USB port of a computer, I've noticed that I got better performance form USB port than from 2A touchpad charger.
Sent from my Nexus 5 using XDA Premium 4 mobile app
Wired charging is always going to be faster than wireless charging. Wireless charging on the Nexus 4 Orb takes about twice as long as charging via the supplied wired charger with the Nexus 5. Technology is going to have to advance quite a bit before wireless charging eclipses wired charging. There is an inherent inefficiency with wireless charging that wired charging does not have.
i bough one of those white, skewed ones off ebay for 10€ shipped and am pretty happy with it!
No
Can a qi charger charge the nexus 5 when data and GPS is being used ?
Will it charge or will the battery drain?
Sent from my Nexus 7 (2013) KitKat 4.4.2
Power consumption during data and GPS use varies depending on what apps are used, signal strength ect... so there is no definite answer. In general, I notice slight battery drain when using navigation when on wireless charging. Google's nav app uses more power than the 500 mah the Qi charger provides but the drain is much slower than on battery alone..
rikudo said:
Power consumption during data and GPS use varies depending on what apps are used, signal strength ect... so there is no definite answer. In general, I notice slight battery drain when using navigation when on wireless charging. Google's nav app uses more power than the 500 mah the Qi charger provides but the drain is much slower than on battery alone..
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Click to collapse
Sorry, but what Qi charger are you using that only provides 500mA?
Even my $15 generic ebay Qi charger gets 751mA.
mmmmBACON said:
Sorry, but what Qi charger are you using that only provides 500mA?
Even my $15 generic ebay Qi charger gets 751mA.
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500 mA was an estimate, individual results vary. Take into account wireless charging has an efficiency of 70-80%, so a charger with a 751mA output would effectively charge at 600-526mA. Add a phone case and/or imperfect alignment charging efficiency drops even lower. In real world use my 750 mA qi charger charges at about the same rate as a 500 mA USB port.
rikudo said:
500 mA was an estimate, individual results vary. Take into account wireless charging has an efficiency of 70-80%, so a charger with a 751mA output would effectively charge at 600-526mA. Add a phone case and/or imperfect alignment charging efficiency drops even lower. In real world use my 750 mA qi charger charges at about the same rate as a 500 mA USB port.
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Oh yeah, I took that into consideration already, which is why I gave such an exact number. I got 751mA from a 5V/1A output rated Qi charger.
I've done a bunch of tests of charge rates with stock, higher amp chargers, and my generic Qi charger.
http://forum.xda-developers.com/showpost.php?p=48856141&postcount=18
As long as the Qi charger you buy is rated as 5V/1A output (which is almost all of them out there, including the official nexus wireless charger, tylt vu, etc.), you should get around the charge rate I mentioned if it's maxed out fully. So people buying the expensive Qi chargers, are not getting any speed improvement over the cheap one I bought. Might look a little nicer sure, but I'll gladly keep the $20 - $50 in my pocket instead. If you want to read my whole post, I linked it.
Here's just the data portion.
Stock 1.2A LG wall adapter: 1053mA
2A USB wall adapter: 1053mA
Built in USB input on power bar: 1053mA
USB 3.0 port (desktop computer): 446mA (surprised it was so low for a USB 3.0 charge port)
USB 2.0 port (desktop computer): 334mA
Generic Qi charger (2A input/1A output)/Built in USB input on power bar: 751mA
Generic Qi charger/Stock LG adapter: 751mA
Generic Qi charger/2A USB adapter: 751mA
Generic Qi charger/USB 3.0 port: 696mA (interesting compared to directly plugging into USB 3.0)
Generic Qi charger/USB 2.0 port: 502mA (low, but again higher than direct cable)
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That's why I was just wondering what Qi charger you had and why you were saying 500mA because that is less than half the charge rate of the stock wall charger.
mmmmBACON said:
Oh yeah, I took that into consideration already, which is why I gave such an exact number. I got 751mA from a 5V/1A output rated Qi charger.
I've done a bunch of tests of charge rates with stock, higher amp chargers, and my generic Qi charger.
http://forum.xda-developers.com/showpost.php?p=48856141&postcount=18
As long as the Qi charger you buy is rated as 5V/1A output (which is almost all of them out there, including the official nexus wireless charger, tylt vu, etc.), you should get around the charge rate I mentioned if it's maxed out fully. So people buying the expensive Qi chargers, are not getting any speed improvement over the cheap one I bought. Might look a little nicer sure, but I'll gladly keep the $20 - $50 in my pocket instead. If you want to read my whole post, I linked it.
Here's just the data portion.
That's why I was just wondering what Qi charger you had and why you were saying 500mA because that is less than half the charge rate of the stock wall charger.
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This is strange, I used the "Current Widget" app as well. . I'm currently using an Anker Powerbank, it's a 6000 mAh battery with a built in Qi charger which shows an average 500 mA charge rate. I also have an official Nexus 5 Qi charger that also shows about 500 mA charge rate. When connected directly to the Nexus qi charger wall adaptor I get a 1560 mA charge rate. Thanks for your data, this makes me wonder how accurate "Current Widget" app actually is since our results differ so much.
rikudo said:
This is strange, I used the "Current Widget" app as well. . I'm currently using an Anker Powerbank, it's a 6000 mAh battery with a built in Qi charger which shows an average 500 mA charge rate. I also have an official Nexus 5 Qi charger that also shows about 500 mA charge rate. When connected directly to the Nexus qi charger wall adaptor I get a 1560 mA charge rate. Thanks for your data, this makes me wonder how accurate "Current Widget" app actually is since our results differ so much.
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Yeah, I used CurrentWidget as well, it's a pretty close estimate, but it won't be 100% accurate. I just didn't want to tear things apart and use a multimeter to take readings. Make sure your CurrentWidget update interval is set to 1 so it gives you live updates. Then you just have to give it a few minutes to stabilize (it will always fluctuate though) and watch for the consistent highest reading over a period of 5 to 10 minutes to be as accurate as you can. For my readings, 751mA kept popping up over and over again but never higher, so it was reasonable to say that was the max my Qi charger was capable as long as it was receiving ample power itself.
The charge rate will also vary depending on where in the battery charge cycle you are recording. At the beginning and end of the charge cycle, it will not charge at full speed and will slow down the charge. This is to protect the phone and the battery. For best range of recording, try to take your readings when your battery is charging around the 25 - 65% full mark, that way you can be pretty confident that your phone/battery is allowing the charger to charge at full speed.
What is your Anker Powerbank output rated as?
Also, was that 1560mA a consistent reading, or just a spike?
Most likely it'll go down if the screen is on, if the screen is off, it may stay or go up extremely slow.
Thanks for the replies.
If the charge will go down when screen, data and GPS are on.. Then it's not really a suitable for a sat naval replacement.
Looks like I'll need to go with a cable.
Sent from my Nexus 7 (2013) KitKat 4.4.2
Look at those car cable mods, they'll meet your needs and will give you an idea on how to hide the cables
Sent from my SM-N9005 using Tapatalk
The qi chargers I tried in the car slowly drain the battery with navigation and streaming music. Do I went back to the cord in the car.
Sent from my Nexus 5 using Tapatalk 2
Don't forget with GPS and other things on your temperature will go pretty high and could reach 45C where wireless charging practically turns off and your charger will only try and maintain the current battery percent. At least this happens to me monitoring it using battery widget.
Sent from my Nexus 5 using Tapatalk
I haven't gone so far as to install current widget, out even better battery stats, but I have taken some long trips with navigation and music streaming, screen on the whole time, and with the cheap Chinese 'c1' car mount, I always arrive with more charge than I left with. Maybe this is because I live in a cold climate, and the charger does not stop because of excessive heat.
Sent from my Nexus 5 using Tapatalk
mmmmBACON said:
Yeah, I used CurrentWidget as well, it's a pretty close estimate, but it won't be 100% accurate. I just didn't want to tear things apart and use a multimeter to take readings. Make sure your CurrentWidget update interval is set to 1 so it gives you live updates. Then you just have to give it a few minutes to stabilize (it will always fluctuate though) and watch for the consistent highest reading over a period of 5 to 10 minutes to be as accurate as you can. For my readings, 751mA kept popping up over and over again but never higher, so it was reasonable to say that was the max my Qi charger was capable as long as it was receiving ample power itself.
The charge rate will also vary depending on where in the battery charge cycle you are recording. At the beginning and end of the charge cycle, it will not charge at full speed and will slow down the charge. This is to protect the phone and the battery. For best range of recording, try to take your readings when your battery is charging around the 25 - 65% full mark, that way you can be pretty confident that your phone/battery is allowing the charger to charge at full speed.
What is your Anker Powerbank output rated as?
Also, was that 1560mA a consistent reading, or just a spike?
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Click to collapse
The Powerbank Qi output is rated at 500 mA. The 1.8A wall adaptor gives a fairly consistent reading above 1500 mA.
I set faster update interval and found the following averages. (Battery @ 50%)
Nexus Qi 1.8A wall adapter: 1500-1605 mA
Nexus 5 stock wall adapter: 900-1000 mA
Nexus Qi charger plate: 450-740 mA
Qi Powerbank 500 mA: 300-476 mA
PC 2A USB port: 550-750 mA
It seems the Current Widget rates the summarized magnitude of draw from the battery. For example having the screen on and higher brightness will subtract from the measured charge. To negate this I placed the phone in airplane mode, screen off and set sampling to 5 s. Then after 10 s turned the phone on to view the last sample taken with the screen off.
Looks like you were right, a 750 mA rated charger factors in transmission losses. The Official Nexus Qi plate puts out 750 mA max. The Powerbank puts out 500 mA as labeled. The 1.8A wall adapter was surprising though. Anand's article stated the max charge rate was 1.2A but the 1.8A adapter clearly exceeds this rate.
rikudo said:
The Powerbank Qi output is rated at 500 mA. The 1.8A wall adaptor gives a fairly consistent reading above 1500 mA.
I set faster update interval and found the following averages. (Battery @ 50%)
Nexus Qi 1.8A wall adapter: 1500-1605 mA
Nexus 5 stock wall adapter: 900-1000 mA
Nexus Qi charger plate: 450-740 mA
Qi Powerbank 500 mA: 300-476 mA
PC 2A USB port: 550-750 mA
It seems the Current Widget rates the summarized magnitude of draw from the battery. For example having the screen on and higher brightness will subtract from the measured charge. To negate this I placed the phone in airplane mode, screen off and set sampling to 5 s. Then after 10 s turned the phone on to view the last sample taken with the screen off.
Looks like you were right, a 750 mA rated charger factors in transmission losses. The Official Nexus Qi plate puts out 750 mA max. The Powerbank puts out 500 mA as labeled. The 1.8A wall adapter was surprising though. Anand's article stated the max charge rate was 1.2A but the 1.8A adapter clearly exceeds this rate.
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That is interesting. My finding mirrored that of Anandtech. I used both the 1.2A stock adapter, and a 2A adapter and I was not able to increase my charging speed at all. It stayed at 1053.
Can you check the plug to see the voltage of the Nexus 5 Qi adapter. Is it 5V?