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USB Fast Charge mod

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There is an app, Chads own Incredicontrol. You need to get the latest version 1.5 beta 3 from his webpage. The version in the market is too old.

Sent from my Galaxy Nexus using XDA
 
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incredicontrol works well, been using it all day
 
mistashaap
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Quote:
Originally Posted by internot View Post
There is an app, Chads own Incredicontrol. You need to get the latest version 1.5 beta 3 from his webpage. The version in the market is too old.

Sent from my Galaxy Nexus using XDA
I checked out that app but I don't see anywhere that it gives a readout of the charging amperage. Am I just missing it?

I did a bunch of trials using the diy method...

with auto bright and data i got 420mA, min bright almost the same, airplane mode 525mA. These are leading me to believe my usb port just aint puttin out.
 
eventnick
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(Last edited by eventnick; 7th March 2012 at 06:21 AM.)
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I want to thank Chad for his work here and report back some of my technical data I have been able gather while testing. This was gathered with electrical test equipment and is accurate unlike the current widgets.


For the Touchstone Mod users:


Prior to Chad's kernel modification the Galaxy Nexus was only able to draw ~430 mA through the Touchstone. For some power users, this was not enough to keep up with heavy usage that included Navigation, 4G, and streaming music simultaneously. Reports had the phone either just barely maintaining its charge % or even slowly losing a couple % points per hour.

After applying Chad's kernel modification the Galaxy Nexus is drawing ~650 mA. An improvement of ~50%! Now the bad news: 650 mA is not as much as you can get from an appropriate wall charger. The limitation at 650 mA appears, in my opinion, to be the Touchstone itself. The Touchstone's supply voltage drops to 4.5V when drawing ~650 mA and the phone stops trying to pull more. This is a limitation of the amount of energy the Touchstone was designed to transfer.

The real question, is if 650 mA is enough to charge the device under the power user conditions I described earlier. Hopefully it is. I do not live in a 4G area so I hope you will all test and report back here.

Thanks again Chad!

For everyone else as well:
To everybody unfamiliar, unless there some undocumented functions to directly read charging current there is no accurate way to read current from apps or widgets. They all make estimates that are only at best, ball park good and only when looking at a long enough time period. Seriously, you won't get within 300 mA. The only way to accurately measure charging current currently (to the best of my knowledge) is to make physical measurements using test equipment such as a multimeter with an ammeter. The current you actually pull from any source will likely fluctuate depending on the limit of current the source is rated for ( and even then, the actual numbers will probably be quite different) and the voltage the source can maintain while supplying that rated current. Do us a favor and don't post the currents your widgets and apps are reporting... they are not accurate and provide little to no information. They may let you see that you are in fact drawing more current than you used to on "USB mode" but that is about it.
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eventnick
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Originally Posted by anton2009 View Post
Let's say for example your phone is a stock 1750mAh (milliampere-hours) or 1.75Ah (ampere-hour) battery. A full charge will carry 1750mAh (1.75Ah). So 1% of 1.75Ah = 0.0175Ah. If you time how long it takes for you battery to charge 1% (i.e. start timing from the second you see it change and stop timing when you see it change again), and turn that many seconds into hours (i.e. x seconds * 1 minute/60 seconds * 1 hour/60 minutes), you can divide 0.0175Ah by that time "x hours," then you will have your charger estimate.

For example, I just timed myself on my stock charger. (Also I have the 2100mAh extended battery).

Took 50 seconds to charge 1% (went from 5% to 6%). So 50 seconds * 1 minute/60 seconds * 1 hour/60 minutes = 0.013888 hours.

0.021Ah/0.013888h = 1.512A or 1512mA, thus my phone is taking 1512mA from my charger.

***Note*** This will not be ENTIRELY accurate as you have the screen on to time how long it takes to charge 1%, and thus will counteract the charger. Also, this will work best when you have a battery percentage lower than 50%.

You are assuming (1) the charging curve is linear and (2) the percentages are accordingly assigned linearly. Do you have any information to back up these assumptions?

Your method may not be valid unless you are certain about these assumptions. For example, most gas gauges in cars are not linear like you would expect them to be either.
 
anton2009
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Quote:
Originally Posted by eventnick View Post
You are assuming (1) the charging curve is linear and (2) the percentages are accordingly assigned linearly. Do you have any information to back up these assumptions?

Your method may not be valid unless you are certain about these assumptions. For example, most gas gauges in cars are not linear like you would expect them to be either.
Yes, please refer to this post. This is why I said it will be most accurate below 50%, as you can see the graph is linear below 58%.
 
eventnick
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Yes, please refer to this post. This is why I said it will be most accurate below 50%, as you can see the graph is linear below 58%.
Great! Thanks for your reply.
 
mistashaap
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Yes, please refer to this post. This is why I said it will be most accurate below 50%, as you can see the graph is linear below 58%.
Now if we could only figure out a way to track percentage changes with the screen off...
 
eventnick
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Now if we could only figure out a way to track percentage changes with the screen off...

It's called a multimeter
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Originally Posted by eventnick View Post

For the Touchstone Mod users:


Prior to Chad's kernel modification the Galaxy Nexus was only able to draw ~430 mA through the Touchstone. For some power users, this was not enough to keep up with heavy usage that included Navigation, 4G, and streaming music simultaneously. Reports had the phone either just barely maintaining its charge % or even slowly losing a couple % points per hour.

After applying Chad's kernel modification the Galaxy Nexus is drawing ~650 mA. An improvement of ~50%! Now the bad news: 650 mA is not as much as you can get from an appropriate wall charger. The limitation at 650 mA appears, in my opinion, to be the Touchstone itself. The Touchstone's supply voltage drops to 4.5V when drawing ~650 mA and the phone stops trying to pull more. This is a limitation of the amount of energy the Touchstone was designed to transfer.

The real question, is if 650 mA is enough to charge the device under the power user conditions I described earlier. Hopefully it is. I do not live in a 4G area so I hope you will all test and report back here.

Thanks again Chad!
I am using the franco kernel app from the market(paid to support the dev) and I am not able to see the touchstone charge at AC, it only charges at USB. Is there something I am missing?

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