Develop Bugs

800 ma vs 1000 ma A/C Chargers

Somehow, I seem to have misplaced the original A/C 1000 ma charger that came with my EVO. I checked out a sort of generic aftermarket charger that was rated at 800 ma.
I have read elsewhere that even the 1000 ma chargers really charge at only 800 ma. Is that true? If so, I'll just get the generic one. I like my phone to charge as fast as possible.
Also, if I have a charger rated at 1.5 amps, will it fry the EVO or just charge it faster? Does the EVO limit its draw to 1 amp no matter what the charger is rated at?

As i understand it, the current draw is controlled by the load (Evo). Only when you force a higher electromotive force (voltage) that there will be a forcing scenario where you're trying to cram more current in to the phone, resistances being the same in both situations.

Evidence suggests that the Evo will only charge a battery at a 650mA rate, even with a 1A+ charger. My own experience seems to verify this because there is no difference in charge times between the OEM 1A charger, an aftermarket 850mA charger, and a USB hub which can supply 2A. They all take about the same amount of time to charge my Evo.
Where I think a more powerful charger might be beneficial is for charging the phone while power-intensive apps are running, although I haven't actually seen any evidence of that yet.
Check out this thread for more info:
http://forum.xda-developers.com/showthread.php?t=833602
And I strongly suggest that you not exceed 5V input. The phone will regulate charging voltage to 4.2V or less and exceeding 5V input will just make the voltage regulator work harder. More about that here:
http://androidforums.com/evo-4g-tips-tricks/213618-lithium-polymer-batteries-101-a.html
Pete

PGRtoo said:
Evidence suggests that the Evo will only charge a battery at a 650mA rate, even with a 1A+ charger. My own experience seems to verify this because there is no difference in charge times between the OEM 1A charger, an aftermarket 850mA charger, and a USB hub which can supply 2A. They all take about the same amount of time to charge my Evo.
Where I think a more powerful charger might be beneficial is for charging the phone while power-intensive apps are running, although I haven't actually seen any evidence of that yet.
Check out this thread for more info:
http://forum.xda-developers.com/showthread.php?t=833602
And I strongly suggest that you not exceed 5V input. The phone will regulate charging voltage to 4.2V or less and exceeding 5V input will just make the voltage regulator work harder. More about that here:
http://androidforums.com/evo-4g-tips-tricks/213618-lithium-polymer-batteries-101-a.html
Pete
Click to expand...
Click to collapse
Thanks Pete,
Interesting. I just want something that will charge faster than it uses juice while on. I use my phone for GPS and Radio quite a bit while in the car and the old car charger wasn't keeping up.
I bought a 75 watt power inverter (everyone should seriously have one of these for their car) and plugged my 800 ma cord into that. I drove for an hour with the GPS running and the phone actually increased it's charge significantly - so I'm happy.
I guess I'll just hang with the 800 then as it was cheap.

FWIW both Kensington and Belkin sell 1A USB chargers which fit in a cigarette lighter socket:
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Sprint also sells an 850mA version in their stores.
I've even seen a 1.25A (1250mA) version somewhere, but I can't remember what the brand was or where I saw it.
Pete

Car Chargers

Hey Everyone,
Thought I would start a car charger thread.
I picked up one of these at Walmart the other day:
http://store.griffintechnology.com/smartphone/powerjolt-dual-universal-micro
And it works quite wonderfully. It's tiny, and even with bluetooth/GPS/Navigation running, it was slowly charging the battery. And it charges it quite quick if you don't have nav running.
It can be a bit annoying to pull out once stuck in, although you probably don't need to do that very often.
- Frank

I have the single port version of the one you have cracking charger and sits flush worth the extra few pounds over the cheap ones and delivers plenty of juice
Sent from my GT-I9000 using xda premium

If you have amazon prime you can get it for less than $10 in two days here:
http://www.amazon.com/gp/product/B0042B9U8Q/ref=olp_product_details?ie=UTF8&me=&seller=
I got it the other day but haven't driven far enough yet to need to use it
Glad to hear though that it charges even while using GPS.

what is the exact output of each USB of this Griffen car charger ?
i have a JABRA charger (comes with JABRA Cruiser) and it doesnt seem to charge my GN while GPS navigation is on (even though its saying charging on the battery icon)
it used to work perfectly on my HTC Desire HD (with GPS+Bluetooth+WIFI ON )
any recommendation on how to fix this please ? like a reference output current that is enough to charge the GN while navigating ?
thanks.

Goodm7sn said:
what is the exact output of each USB of this Griffen car charger ?
i have a JABRA charger (comes with JABRA Cruiser) and it doesnt seem to charge my GN while GPS navigation is on (even though its saying charging on the battery icon)
it used to work perfectly on my HTC Desire HD (with GPS+Bluetooth+WIFI ON )
any recommendation on how to fix this please ? like a reference output current that is enough to charge the GN while navigating ?
thanks.
Click to expand...
Click to collapse
The Griffen claims 1A per USB port, and I believe it.
Online reviews say some users with other phones need to mod the Griffen to charge their phone, otherwise it only supplies 100mA. Some crack open/mod the Griffen to short two terminals to get the full charging ability, and/or use a 'charging cable' which shorts the terminals within the cable.
As a reminder, the Griffen seems to charge the Note full blast, but perhaps something similar is needed for the Jabra. I suggest installing 'Currentwidget' to see what sort of charge you are getting.
- Frank

SGP has one as well, it will lit up BLUE!
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OR you can just get a no brand one on eBay for around $3.

ChodTheWacko said:
The Griffen claims 1A per USB port, and I believe it.
Online reviews say some users with other phones need to mod the Griffen to charge their phone, otherwise it only supplies 100mA. Some crack open/mod the Griffen to short two terminals to get the full charging ability, and/or use a 'charging cable' which shorts the terminals within the cable.
As a reminder, the Griffen seems to charge the Note full blast, but perhaps something similar is needed for the Jabra. I suggest installing 'Currentwidget' to see what sort of charge you are getting.
- Frank
Click to expand...
Click to collapse
Thank you for the reply.
I have battery monitor widget installed & it shows charging via usb when i connect it to jabra charger, but the weird thing is that the galaxy note starts mtp mode once i connect it!
Could it be the cable? Or shall i just take the griffin charger to solve this?
By the way,griffin charger works out of the box out do i have to solder modify it?
Cheers

I just bought this dual port 2.1A + 1A charger on eBay for £2.49 inclusive and delivered the following day....
http://www.ebay.co.uk/itm/2-1A-Dual...neChargers&hash=item19ca66b4df#ht_2865wt_1163
At first it seemed the phone was only drawing a "USB" level of current, so I was all set to rip it apart and solder the centre pins to force AC charging, but when I double checked with a dry run and a temporary short the phone switched to AC charging. Now it seems to be continuing to draw "AC" levels, so maybe I had a poor contact initially and a few (un)plugging operations have made the contacts more reliable. I'll try it out later today with satnav running and see if it keeps up with the pace and report back.
EDIT : Charge level draining like water out of a sieve with this thing whilst running satnav, and the phone said it was "AC" charging too. Switching ports didn't help.

i'm using the official car charger from my old nexus, the only charger i found can charge my phone with 3g and nav on because of the 2A output. other cheap usb chargers i tried with so called 2A output just don't work
Sent from my GT-N7000 using XDA App

A couple months ago I got this one for my SGT:
http://www.cyberguys.com/product-details/?productid=51740
It does 2.1a. I paid full price:-( not the current sale price. Works fine with my SGN.
Sent from my GT-N7000 using xda premium

Review of Anker dual usb port 4.8A (24W) car charger w/lots of pics!!!

This is a review of Anker dual usb port 4.8A (2x 2.4A, total 24W) car charger. http://www.ianker.com/product/71AN2452C-WA
Just a few months ago I reviewed Anker's dual usb car charger with 3.6A combined output. One of the comments I heard back was about charging Note 2 and iPad 4th gen. As you know, Note 2 needs 2A for a full charge while 4th Gen iPad needs 2.4A. Or perhaps you got Note 3 in addition to Note 2 and need to charge up both of these 2A phablets in your car. In that case 3.6A doesn't cut it. The solution: 4.8A charger with dual usb port output each being able to deliver 2.4A.
Continuing with their new environmentally safe cartoon package, this one arrived in a neat little box. In addition to car charger, it came with Instruction manual which I want to mention specifically since Anker has been updating these with more and more useful details. They might as well call it a car charging Guide. But one thing I do have to mention, even so this charger has 2 ports labeled Android and Apple - in case of Note 2 or any other newer Galaxy phones, both ports can be used to charge your phone at full speed as I captured in the pictures below using Galaxy Charging current app.
This new 4.8A charger is the same size as their previous 3.6A model. Its very compact at 31g with 2.9" in length and 1" x 0.9" at the dual usb port opening which is smaller than some of the other single output car charger. This car charger is able to accommodate simultaneous charging of 2 plugged in devices at 2.4A each for a total output of 4.8A, and according to instruction manual has built-in multiple circuit protections. With Anker's standard 18 months warranty from the date of purchase, and a current price of $11.99 - this is one fantastic value and definitely a highly recommended accessory if you want to charge multiple power hungry devices at full speed in your car.
Here are the pictures.
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+1
Sent from my GT-N7100 using xda app-developers app

thank you for the review! What micro-usb cable are you using to charge the device? I'm noticing that the cable has much to do with the amperage being drawn from testing I've done with all the cables and chargers I have.

Thanks again, Vectron. Excellent review.
By the way, how did you find the accuracy of the app you were displaying to measure the current?
I bought the USB power monitor that you reviewed. I d/l the app Galaxy current (the same one you
are using) and they never matched each other. The app always show 1800 like yours when the USB
gadget wasn't installed (on a 2A charger). It showed very differently with it inline, like 1100 mA.
I wonder if you saw the same thing?

testrider said:
Thanks again, Vectron. Excellent review.
By the way, how did you find the accuracy of the app you were displaying to measure the current?
I bought the USB power monitor that you reviewed. I d/l the app Galaxy current (the same one you
are using) and they never matched each other. The app always show 1800 like yours when the USB
gadget wasn't installed (on a 2A charger). It showed very differently with it inline, like 1100 mA.
I wonder if you saw the same thing?
Click to expand...
Click to collapse
To be honest, the app and usb dongle are great for relative measurements, not the actual accurate measurement. That is a truth. When you have a dozen of different cables and chargers and trying to make sense out of it, these tools come very handy to determine which combination will give you the highest charging current. Is it accurate? The only way to check it by dealing with a known mAh capacity target and timing how long it will take to charge it from zero to full (or some starting percentage which you will have to factor into your final calculation). Once you know total charged "mAh" capacity and "h" it took to charge, you calculate by dividing mAh/h to get your mA charging current speed. On a few occasions I came very close with what I have been reading with Charging Current app. But in general, just use all this as a tool to determine best combo of your external charger/cable.

Looking Nice......

Tronsmart WC2F 36W Dual Ports USB Wall Charger review

Tronsmart is a most popular manufactory in mobile phone accessories, especial in certified Quick Charge 2.0 charger. I have already tested one charger from them before, but now, they have just released more chargers with more powerful features which you can’t resist.
In this short test I will test Tronsmart WC2F which features 2 quick charge 2.0 port for fast charging 2 devices at the same time, both port can reach maximum of 15V/1.5A each.
You can check out more features, including where you can buy this amazing charger from their official website at: http://www.tronsmart.com/products/tronsmart-wc2f-36w-dual-ports-usb-wall-charger-black
Let’s see what we got here.
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There is not much to talk about the packaging, it’s simple and environment friendly. At the back of the package, we can find their company address, phone number and email for support.
Inside the package, we will have a charger, 2 USB cables, 1 manual, 1 VoltIQ sticker.
Here are our charger, naked.
Yes, there is also a manual for a charger, in case you don’t know how to charge your devices, you can open this manual, they will show you.
Let’s take a closer look at the charger. At the front of the charger, we can find Tronsmart logo, a small indicator light.
At the back, we can find the charger specifications, as we can see, it can charge at 5V/2.4A, 9V/2A, 15V/1.5A for each ports.
More fancy images
Let’s do the test, I will use a usb detector to monitor the charger voltage and ampere, this detector can monitor up to 9V/5A, and I will use my Zenfone 2 to test this charger which can charge maximum at 9V/2A so I think the detector will survive.
More fancy images
I will charge my phone from 10% to 100%, and monitor via Asus stopwatch app, as for new software update, Asus has changed how fast charge works, they will limit the ampere to 0.83A when the screen is on, and can only charge at maximum when the screen is off.
It took about 1 hour and 45 minutes to completely charged Zenfone from 10% to 100%, the phone itself would limit the ampere to 0.35A when it reached 90% so we could charge faster with full ampere.
So here are some pictures of the test.
Let's get started.
The phone is increasing the ampere when the screen is off.
It took 6 mins to charged 16%.
10 minutes to 22%.
23 minutes to 39%.
35 minutes to 52%.
54 minutes to 75%.
From this time, my phone was limited the ampere to normal charging, which took more time to fully charged. It took 1 hour 25 minutes to reach 93%.
1 hours 30 minutes to reach 96%.
And finally, the phone phone was fully charged in 1 hour and 45 minutes.
Conclusion
This is a great fast charger with a great build quality, solid USB cable for long time usage, build-in 2 quick charge 2.0 ports so you can charge 2 devices at the same time.
The only disadvantage from the charger is the temperature when you charge 2 devices at the same time, it’s really hot, I don’t have any device to monitor the temperature, but it was very hot when I touch the charger.
For the price of $21.99 USD, this is the best charger in its price range and a good alternative for original Asus BoostMaster charger which costs about $29.99 USD. You can buy this charger at.
Amazon: http://www.amazon.com/dp/B0186Y3GDY
GeekBuying: http://www.geekbuying.com/item/Tron...nd-up-Fast-Wall-Charger---US-Plug-359233.html

Hello, I just want to know whether this charger is backwards compatible. Means if I have phone with no quick charge, 5v 2A input will it work..??
Regards

I'm more interested in that voltage ampere indicator/detector
Where can I buy that?

SleepingAran said:
I'm more interested in that voltage ampere indicator/detector
Where can I buy that?
Click to expand...
Click to collapse
aliexpress cheap and best. delivery may take little longer. but its worth to wait when you get the same thing dirt cheap comparing local market

Managing / monitoring quick charge

Hi guys .
I was wondering if anyone has come across an app or a method of telling which QC charging profile our HTC 10s are using?
As an example, my HTC is currently at 50%, and due to the fact I will be going out after work, I decided to plug it in to top up. My desktop charger is a QC 2.0 charger from Tronsmart - and supports 5V/2A, 9V/2A and 12V/1.5A.
Once I plug in, the phone registers the charger as a quick charger, and booting up Ampere reads a charge speed of 2460 mA at 4.217 volts = 10.3 W. Even if I take the standby drain into account (measured by Ampere at -360mA) = 2820 mA x 4.217V = 11.9W.
This seems a little ways off from the 18W charging profiles.
So, is there a set of environmental criterium that has to exist for the 18W profiles to kick in? if so - what are they?
or, is Ampere possibly unable to measure the amperage or voltage accurately?
or, is this effectively 18W, and there are 6W worth of losses from resistance or heat? (1/3 in losses seems a little high for me?)
PS, the cable I am using with the tronsmart is a USB A to C cable from Belkin, very thick gauge too.

sephstyler said:
Hi guys .
I was wondering if anyone has come across an app or a method of telling which QC charging profile our HTC 10s are using?
As an example, my HTC is currently at 50%, and due to the fact I will be going out after work, I decided to plug it in to top up. My desktop charger is a QC 2.0 charger from Tronsmart - and supports 5V/2A, 9V/2A and 12V/1.5A.
Once I plug in, the phone registers the charger as a quick charger, and booting up Ampere reads a charge speed of 2460 mA at 4.217 volts = 10.3 W. Even if I take the standby drain into account (measured by Ampere at -360mA) = 2820 mA x 4.217V = 11.9W.
This seems a little ways off from the 18W charging profiles.
So, is there a set of environmental criterium that has to exist for the 18W profiles to kick in? if so - what are they?
or, is Ampere possibly unable to measure the amperage or voltage accurately?
or, is this effectively 18W, and there are 6W worth of losses from resistance or heat? (1/3 in losses seems a little high for me?)
PS, the cable I am using with the tronsmart is a USB A to C cable from Belkin, very thick gauge too.
Click to expand...
Click to collapse
Ampere can't see past the phones own battery charging circuitry and know what it's being fed.
If you really want to see what the phone is being fed, get yourself a USB power meter.
This guy sells those "YZXstudio" meters http://www.ebay.com/usr/f-t-2000
Feature comparison matrix
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And in before you ask, yes they're QC3.0 compatible because backwards compatibility.
@Haldi4803 has ordered/received a power meter as well, don't know which one he got but he reported this in the megatech thread.
3. My Powermeter is here <3 gonna open my own Thread soon. Sadly the Bluetooth App failed so I don't have the charging measurement from 30-100% from last night. But.....
At 30% it charges with 7V !
071010,022593
7.1V 2.2A = 15,6W
When at 100% Idle Voltage is about 6,3V
When connected to the Powerplug and on 100% Battery you can Benchmark as much as you want, the battery does NOT Drop. So you can use this to control if Trepn Profiler is correct in Powerdrain.
Click to expand...
Click to collapse
Judging by the "bluetooth app", did you get one of these YZX meters Haldi?

Bingo
Soldered the additional Bluetooth module on and it's awesome!
http://forum.xda-developers.com/showpost.php?p=62775148&postcount=130
QuickCharge.... like every other charging technologie tries to safe the Battery from harm. Therefore only on the lowest battery level you will be charging with a low of Watts. On 50% ? Well.... i'll tell you the next time my Phone is empty Benchmarking in Progress.....