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Re: How does an app estimate charging current?

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On 08/15/2016 11:13 PM, Aardvarks wrote:
> On Mon, 15 Aug 2016 17:37:42 +0100, David Taylor wrote:
>
>> A phone can measure the battery voltage, and perhaps the battery
>> temperature to determine end-of-charge.  Many Li-ion cells have these
>> measuring facilities built-in, which is why they have more than two
>> terminals.
>
> My battery is constantly draining even when the little lightning bolt shows
> it's charging. This happens with multiple cables & chargers.
>
> All the charging report apps I tried show 0 amps going into the battery:
>
> Charging Report by PlayfulGeeks
> https://play.google.com/store/apps/details?id=com.playfulgeeks.chargingreport
>
> Ampere by Braintrapp
> https://play.google.com/store/apps/details?id=com.gombosdev.ampere
>
> BatteryBot Battery Indicator by Darshan Computing, LLC
> https://play.google.com/store/apps/details?id=com.darshancomputing.BatteryIndicator
>
> The phone also gets very hot to the touch, and sometimes shuts off the
> charging (as if it was happening) saying the battery was too hot.
>
> I think the microusb connector is the culprit but I don't know (as it's
> soldered on in the Samsung Galaxy S3).
>
> The phone does have two files that I can "cat" with a terminal program, but
> they always just have a "0" in them for the current.
> http://www.programcreek.com/java-api-examples/index.php?source_dir=Battery-Indicator-Pro-master/src/com/darshancomputing/BatteryIndicatorPro/CurrentHack.java
>
> I can "see" that file by opening up the Android terminal emulator to type:
> cd /sys/class/power_supply/battery/
> ...
> cat current_now (No such file or directory)
> cat current_avg (0)
> cat current_max (No such file or directory)
> ...
> ls batt* (lots of stuff)
>
> I think all the current apps just read one or more of those files.
> But HOW does the current get *into* those files?
>

Sounds to me like maybe time to replace the phone.  Unless it's one of 
the increasingly-rare ones that have replaceable batteries, then you 
have to figure out whether just replacing the battery would do the job. 
IOW from what you've posted it sounds like the battery is shot and maybe 
the connector too.  Only so much diagnosis is useful, beyond that you've 
spent more time than a new phone costs.

Gee, do you have an iPhone yet?

[Sorry, irredeemable-smartass genes in my genetic mess.]

-- 
http://totally-portable-software.blogspot.com
   [Sat Mar 26: "Documentation and Portability"]

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How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-15 02:13 +0000
  Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-15 06:31 -0600
    Re: How does an app estimate charging current? David Taylor <david-taylor@blueyonder.co.uk.invalid> - 2016-08-15 17:37 +0100
      Re: How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-16 05:13 +0000
        Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-16 05:28 -0600
          Re: How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-16 13:43 +0000
            Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-17 04:59 -0600
        Re: How does an app estimate charging current? David Taylor <david-taylor@blueyonder.co.uk.invalid> - 2016-08-16 17:07 +0100
        Re: How does an app estimate charging current? Nigel Wade <nmw@local.domain> - 2016-08-17 15:50 +0100
          Re: How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-17 17:12 +0000
      Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-16 05:22 -0600
        Re: How does an app estimate charging current? pamela <invalid@nospam.com> - 2016-08-16 21:07 +0100

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