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FS#8596 - Calibrate ipod 5g 64MB (60/80GB) battery discharge

Attached to Project: Rockbox
Opened by Dave Hooper (stripwax) - Tuesday, 12 February 2008, 00:21 GMT+1
Task Type Patches
Category Battery/Charging
Status Unconfirmed
Assigned To No-one
Player type iPod 5G
Severity Low
Priority Normal
Reported Version current build
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Private No

Details

Adds runtime calibrated from (numerous) battery_bench runs on ipod 5g 64mb (60gb)
   ipod_battery_discharge.patch (1.9 KiB)
This task depends upon

Comment by Ryan Sawhill (ryran) - Monday, 25 February 2008, 08:04 GMT+1
Hey Dave. Did you make this using data from the testing of Andree's PP502x work ... or just from your own benches?
Comment by Dave Hooper (stripwax) - Saturday, 12 April 2008, 17:34 GMT+1
My own benches after Andree's work had been committed to svn. They were correct as of the time of the original patch but I don't know if svn has got better (or worse) since then. But when http://www.rockbox.org/tracker/8603 get committed the calibration will need to change again.
Comment by Yoshihisa Uchida (Uchida) - Sunday, 08 June 2008, 09:35 GMT+1
I use the iPod 5g 60GB (The battery is the original battery(600mAh)).

My iPod's battery bench result is following:

max battery voltage is maybe 4100 - 4180 mV,
min battery voltage is maybe 3300 - 3360 mV.

These result is different Dave's result.
Is the battery of my iPod old?
Comment by Dave Hooper (stripwax) - Wednesday, 13 August 2008, 00:02 GMT+1
Can you post your battery bench file here?
Comment by Yoshihisa Uchida (Uchida) - Wednesday, 13 August 2008, 05:46 GMT+1
I post my iPod's battery bench result.
   battery_bench.txt (165.1 KiB)
Comment by Dave Hooper (stripwax) - Sunday, 09 November 2008, 22:50 GMT+1
What battery life do you get with the original firmware (= this will be the best way to determine if your battery is faulty / on the way out)
I've combined your bench with today's bench of my own (my bench is svn here, looping mp3 playback, accessory volatage turned off) - OpenDocument format complete with chart

Some observations on your battery bench:
Starting voltage is indeed lower than mine. Was the battery fully charged (e.g. charged in the original firmware until it reported fully charged)? If not, maybe your battery is indeed losing capacity through age/usage

Your bench shows clear spikes due to the spinup/down for logging purposes. The latest battery bench does a somewhat better job of this, so if you could post an updated battery bench that would be really excellent.

Ending voltage is basically 3545mv. You can see from your log that only the last two lines report a voltage lower than 3545, and both of those are around 3370mv, and the step between 3545mv and 3365mv is about twenty seconds. This looks like the knee of your battery discharge curve. I would say 3545 is meaningful, and the readings below that are not important. I.e. if your battery is already reading 3370mv, there is probably not enough charge to save state and cleanly shutdown.

Even on that basis, your final discharge voltage is also lower than mine, not sure how to interpret that (could mean you battery is old, or mine is misreporting its voltage). 3550mv or thereabouts could be the best voltage at which to perform emergency shutdown
   battery_bench.ods (149.1 KiB)

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