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QI Charger which PSU ?

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By albert_htc, Senior Member on 29th January 2014, 07:58 PM
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Hi

Didn't think of this before I bought it.. But I've just received a QI charger from Amazon.

Which charger do I used with it?
The one from my nexus 5 or the one from the nexus 7 2013?
Ideally I want to be able to charge either device.

The QI states 5v 1500ma input.

Also what's the best app to monitor the charging, time, input heat etc?

Thanks

Sent from my Nexus 7 (2013) KitKat 4.4.2
 
 
29th January 2014, 11:19 PM |#2  
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I can't say for what apps to monitor times etc... But

Did your qi charger not come with a mains power adapter.
I can't say for the nexus 7 but the nexus 5 comes with a 5v 1200ma charger so it won't be able to supply the current that your qi pad needs.
Have a look on your nexus 7 power brick. It will tell you what it outputs.

Nexus 5
Input : 100-240V
50/60hz 0.2A
Output : 5.0V 1.2A

Sent from my Nexus 5 using xda app-developers app
30th January 2014, 03:38 AM |#3  
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Quote:
Originally Posted by albert_htc

Hi

Didn't think of this before I bought it.. But I've just received a QI charger from Amazon.

Which charger do I used with it?
The one from my nexus 5 or the one from the nexus 7 2013?
Ideally I want to be able to charge either device.

The QI states 5v 1500ma input.

Also what's the best app to monitor the charging, time, input heat etc?

Thanks

Sent from my Nexus 7 (2013) KitKat 4.4.2


what brand? you can try plugging it in your laptop. mine (Nillkin) says Input: 5V/2A but it still works just fine if i plug it in the laptop.
otherwise I use the Nexus 5 charger. I think it's just the maximum your charger can handle.
Last edited by the_slasher; 30th January 2014 at 03:38 AM. Reason: format
30th January 2014, 04:06 AM |#4  
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You can use any USB power source... What varies is charge rate. I picked up a 2amp supply from amazon. You have to figure in less than 70% efficiency... Especially taking into account non laboratory ideal conditions and manufacturing...


1 amp input will be like slow charging from a computer at best. 2 amp will be on par with regular wall charging if not better. You always want an adapter that is above what the charger can handle to make full use of the charger... Lower ones will still let it work to lesser and lesser degrees till it doesn't charge the device depending on supply and device needs
30th January 2014, 04:54 AM |#5  
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Quote:
Originally Posted by albert_htc

Hi

Didn't think of this before I bought it.. But I've just received a QI charger from Amazon.

Which charger do I used with it?
The one from my nexus 5 or the one from the nexus 7 2013?
Ideally I want to be able to charge either device.

The QI states 5v 1500ma input.

Also what's the best app to monitor the charging, time, input heat etc?

Thanks

Sent from my Nexus 7 (2013) KitKat 4.4.2

It can be used with either the Nexus 5 or Nexus 7 AC Adapters. The Nexus 5 is 1.2A and the Nexus 7 (2013) is 1.35A I believe. Neither will fully power the Qi charger, but it will still be enough to make it work. The charging time for your phone will just be longer since the Qi charger is not being provided full power, so the current the Qi charger can provide to the phone will also be lower. If you want your Qi charger to operate at full efficiency/power, try to use an AC adapter that is 1.5A or higher.

Since your Qi charger only requires 1.5A, the Nexus 7 AC adapter is the closest, so I would recommend using that one.

In the future though, you might want to consider buying a higher output AC adapter:

The Blackberry Folding Blade Charger is 1.8A output, and microUSB, so you can plug it directly into your Qi charger (or phone if you ever need to charge you phone at rocket speed!):
http://www.amazon.com/Blackberry-Fol...b+wall+adapter

The Boxwave Fast microUSB charger provides 2A output, microUSB as well, so if you ever buy another Qi charger it would be good, as many Qi chargers require 2A input.
http://www.amazon.com/BoxWave-Amazon...rds=boxwave+2a

You could also just buy an adapter similar to the Nexus 5/7 without the cord attached. For example, something like this.
http://www.amazon.com/PowerGen-2-4-A...id+usb+charger

As for the app, with all of your criteria, I would suggest Battery Monitor Widget
https://play.google.com/store/apps/d...cc71.bmw&hl=en
30th January 2014, 04:57 AM |#6  
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Quote:
Originally Posted by mmmmBACON

As for the app, with all of your criteria, I would suggest Battery Monitor Widget
https://play.google.com/store/apps/d...cc71.bmw&hl=en

+1 on ccc71's apps -- I had several of his first-generation ones and recently took his generous offer to consolidate into Android Tuner (his all-in-one app). He has been great to work with on a dev level and his apps reflect his top-notch skills.

https://play.google.com/store/apps/details?id=ccc71.at (Yes, I found it valuable enough to go with the paid version)
https://play.google.com/store/apps/d...=ccc71.at.free
Last edited by jeffsf; 30th January 2014 at 05:04 AM.
30th January 2014, 08:59 PM |#7  
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Thanks for the replies
I've tried my nexus 7 charger with the qi pad and ran battery monitor widget.

Tablet showed at -432ma, sat it on the qi pad and it changed to -124ma!!

Why a negative figure ? I assume I'm using more power than its charging.

Would a 5v 2a charger male much difference ?

Sent from my Nexus 7 (2013) KitKat 4.4.2
1st February 2014, 10:49 PM |#8  
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Hi
Just had a thought the value I'm ready is when the screen is on, out it being off make any difference ?

Sent from my Nexus 7 (2013) KitKat 4.4.2
1st February 2014, 11:01 PM |#9  
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Try using currentwidget (free) to read just the current being provided during charge.

Set it to update at 1 second intervals.

Even with the screen on, if you are not using navigation, streaming stuff, gaming, etc. it should charge even if it is not getting the full 1.5A current provided to it. It would just charge slower not discharge.

Sent from my Nexus 5 using xda app-developers app
2nd February 2014, 12:56 AM |#10  
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Quote:
Originally Posted by albert_htc

Thanks for the replies
I've tried my nexus 7 charger with the qi pad and ran battery monitor widget.

Tablet showed at -432ma, sat it on the qi pad and it changed to -124ma!!

Why a negative figure ? I assume I'm using more power than its charging.

Would a 5v 2a charger male much difference ?

Sent from my Nexus 7 (2013) KitKat 4.4.2

As I learned from another thread, the cable makes a significant difference. After using a 2a charger, current widget, and checking the charge of all my cables: 2 provided about 1.4a, a few 1.1a,and a large number of cables cut power down to 600 down to 300.

You need a capable 2a charger, a quality cable that you have actually tested, and a qi charger that accepts 2a and doesn't lose a majority when converting to induction.

Sent from my Nexus 5 using Tapatalk
2nd February 2014, 01:13 AM |#11  
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Quote:
Originally Posted by Double03

As I learned from another thread, the cable makes a significant difference. After using a 2a charger, current widget, and checking the charge of all my cables: 2 provided about 1.4a, a few 1.1a,and a large number of cables cut power down to 600 down to 300.

You need a capable 2a charger, a quality cable that you have actually tested, and a qi charger that accepts 2a and doesn't lose a majority when converting to induction.

Sent from my Nexus 5 using Tapatalk

Did it happen to be this thread? http://forum.xda-developers.com/show....php?t=2609087

You might have read that from one of my posts hahah.

I've said in different Qi charger threads to have a good 2A charger and to replace the included micro USB cable with higher quality cables (premium monoprice cables, or the Motorola Ecomoto)

I did a video demonstration on USB cable quality here. Didn't expect that drastic of a difference.
http://forum.xda-developers.com/show...0&postcount=52
Last edited by mmmmBACON; 2nd February 2014 at 01:30 AM.

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