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iPod 3rd Gen' - Battery Issue, Even after upgraded battery installed

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Llorean:
It's simply a hardware issue. Readings are made as accurately as what the hardware will tell us. It may be that the Apple firmware uses an old reading after sleeping until the battery has time to settle, or has some other cleverness we don't know about, or it may be there's still room for improvement in our code.

dreamlayers:
In powermgmt-ipod-pcf.c, percent_to_volt_discharge only has values for Nano, Video and Color iPods.  Then there's this:
/* FIXME: calibrate value for other 3G+ ipods */
/* Table is "inherited" from iriver H100. */

Edit: Also, initial battery readings after power on can be low due to all the hard drive activity at power on.  They increase after a few minutes.  I even see this with the 5G Apple firmware after a fresh boot.

lawlcake:
So, dreamlayers, what you're saying is the amount of volts that is being used in the iPod 3rd Gen is more suited to the more recent iPods (IE, video, nano, etc), and therefore, are using more power than it should. Correct or incorrect?

If that's the case, then how can this be fixed?

dreamlayers:

--- Quote from: lawlcake on March 06, 2009, 11:01:04 AM ---So, dreamlayers, what you're saying is the amount of volts that is being used in the iPod 3rd Gen is more suited to the more recent iPods (IE, video, nano, etc), and therefore, are using more power than it should. Correct or incorrect?

If that's the case, then how can this be fixed?

--- End quote ---
No.  Sorry, I guess I was being a bit too technical.

The thing being measured is battery voltage.  It's impossible to directly measure percentage of charge.  Rockbox uses a table to translate voltage to percent of charge.  Right now Rockbox does not have a table for the 3rd gen iPod, and it uses a table from another device.  This causes the reported percentage to be less accurate.

This has no effect on power consumption.

You can help by performing a battery bench and posting the results.  For instructions, see http://www.rockbox.org/twiki/bin/view/Main/BatteryRuntime
Ideally, someone with an original battery should do the test, but I guess all original 3G iPod batteries have worn out by now.  This test will also allow you to see how well your battery performs. 

lawlcake:
Now here's something interesting that happened to my iPod. After playing some music for, lets say, about 30 - 40 minutes, my iPod got VERY hot. It seems that the hard drive just kept on... doing things while I was listening to music, thus decreasing my battery life. However, once I switched to the iPod firmware, there was decreased activity in the hard drive, and therefore, more battery was conserved. Just something slightly interesting to note...

This weekend, I'm definitely gonna do that battery bench testing, and see what the heck is going on with my iPod. I'll post the results here, of course. Thanks to everyone for their help!

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