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

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......

[Q] Charger issue.

I bought a Galaxy Tab S 10.5 when I was in Europe but now that I'm back home I can't use the charger cause they're different than what we use here. Do I have to buy a new one or is there any chance I can use my Galaxy S4's charger? I understand the chargers have some sort of voltage information I don't know if my phone's charger will work since the batteries are not the same. Thanks for your time.
Here's a picture with both chargers. Left is the Galaxy Tab S's. Right is my phone's. They appear to have the same values, I still ask because I noticed its taking a long time for the tab to charge.
http://i.imgur.com/rqxBFHH.jpg

Maybe not the exact answer your waiting for but anyhow.
There is a lot of talk about cables and chargers not working properly. So I installed Galaxy Charging Current (Play store) and checked all my chargers and cables.
First off all my cables worked fine, but thats not what your asking.
Install the app on your tab and check with what value its charging.
Then you know for sure if you can use the charger on the right. (Or buy a europe tot US adapter for your 5.3 volt charger)
(I charge my phone wit the tab charger and have no problem)

I bought this little usb amp/volt meter and checked all my chargers and cords. Maybe 10% of them were junk. Some actually put out 5.3 volts like the stock charger. They all put out different amps. Some below 1.

Hans,
I downloaded that app. I dont know what I'm looking for. Here is a screenshot. Can you tell me what the readings mean and if I'm within the norms? Thank you!
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Here is another reading a few minutes later as it warmed up..
and lastly, ten minutes later, as the charger is now fully hot..

This app is useless. Its readings have nothing to do with real current from charger. I have PortaPow USB Power Monitor and it clearly shows that Tab S 10.5 takes 1.75A from oem charger and this app shows values between 1 and 1.2A.

SotYPL said:
This app is useless. Its readings have nothing to do with real current from charger. I have PortaPow USB Power Monitor and it clearly shows that Tab S 10.5 takes 1.75A from oem charger and this app shows values between 1 and 1.2A.
Click to expand...
Click to collapse
I dont know if its useless but when T700 is connected to my pc it show 476 mA , connected to my original charger it shows 1800 mA and connected to my 1 amp phone charger it shows 745 mA.
The values that I expected.
From the makers site I learned only Maximum value is important.

Where the USB plugs into the tablet to charge. Is it suppose to get really warm?

HANSB57 said:
I dont know if its useless but when T700 is connected to my pc it show 476 mA , connected to my original charger it shows 1800 mA and connected to my 1 amp phone charger it shows 745 mA.
The values that I expected.
From the makers site I learned only Maximum value is important.
Click to expand...
Click to collapse
It shows what your tablet should take from the charger not what it is actually taking. So if you connect it to 2A charger it will show 1.8A because that's maximum value Samsung designed Tab S to be charging at. I did lot o testing and this app will always show 1800mA maximum when tablet is actually taking much less current for example when connected with long cable (15ft). My testing shows that longest cable I can use is 10ft 28/24AWG from Monoprice and oem charger. 15ft cable is only charging at 1.2A and any cable longer than 3ft is unusable with Anker 40W IQ charger. OEM Samsung charger gives 5.45V not ~5V as any other USB charger.

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

Tronsmart Presto: The new 12000 mAh Quick charge 3.0 powerbank

Our new smartphone is more powerful everyday, but we just can’t put a big battery in a small and slim device, so they invented PowerBank.
Tronsmart is one of the first manufacturer to introduce Quick charge 3.0 PowerBank, they named it “Presto”, it’s powered by 12000 mAh battery which can charge up to 4 times for our Zenfone 2. Sadly, this powe rbank supports QC 3.0 but our device can only charge with QC 2.0.
Tronsmart Presto Specifications:
Qualcomm Quick Charge 3.0: Up to 4x faster than standard chargers, able to charge compatible devices to 80% in just 35 minutes. Backwards compatible with all versions of Qualcomm Quick Charge.
Type-C Input and Output: Use it to quickly recharge the 12000mah external battery, or to power your Nexus 6p/5x with USB-C/Type-C ports.
Remarkably Compact: Much smaller than other high-capacity portable chargers. No other charger packs this many recharges at such high speed into such a small space.
Stylish, Practical & Safe: Smooth ebony varnish with 4-LED battery level indicator, 100% safe circuit protection; charger automatically shuts down if short circuit or overload occurs to protect your devices.
You can check out more information and the price at: https://www.amazon.com/Tronsmart-Pr...d=1466731576&sr=8-3&keywords=tronsmart+presto
What You Get in the box: Tronsmart Quick Charge 3.0 12000mAh power bank, 30cm USB-C to USB-A cable, welcome guide, our worry-free 18-month warranty and friendly customer service.
1. The packaging:
There is not much to say about the packaging, but here are some pictures:
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Inside the box:
2. Tronsmart Presto Power Bank:
The power bank is made from all plastic, with black color and solid build. I really like this over Xiaomi Power Bank because the Mi Powerbank is easy to get dirty as there is a lot of dust in my place.
On the front of the Tronsmart Presto power bank, you will see a Tronsmart logo and 4 stylist battery level indicator white LED.​
On the back, you will see some technical informations about the output and input of the power bank. Here is a closer look:​
On the top, there are two port, the USB 3.0 port is for output only, but the USB-C port you can use it for both output and input (to charge your devices or to charge your powerbank).
The power bank comes with one 30cm length USB-C and USB 3.0 cable, the cable is solid too.​
On the side, you can find the power button, you have to put it to power on the Tronsmart Presto before use (not like Mi Powerbank, you just put the device in and it will automatic charge your device!).
3. Charging Zenfone 2 with Tronsmart Presto.
I’m using Zenfone 2 with Anker cable to test Tronsmart Presto power because Zenfone 2 doesn’t support USB-C.​
I started charge the device from 3%, and it took 10 minutes to charge from 3% to 17%.​
I got 20% in 13 minutes. There is not much heat as QC 2.0 charger.​
I got 41% in 29 minutes.
​
I got 58% in 42 minutes.​
I got 79% in 1 hours and 2 minutes, the phone is now charging at normal mode to extend the battery life.​
I got 89% in 1 hours and 16 minutes.​
The phone is now fully charged at 1 hours and 48 minutes.​
4. Summary
Pros
Solid build.
One of the first QC 3.0 compatible power bank for fastest charging speed.
Not much heat generated while charging.
Cons
Not much accessories.
A bit boring design.

Thanks for the review!