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Subject: ipod Ogg battery life

ipod Ogg battery life

From: John Sheahan <jrsheahan_at_optushome.com.au>
Date: Sat, 29 Aug 2009 13:37:43 +1000

Hi
I recently upgraded an older first generation ipod mini,
its now got an 8g flash and rockbox nightly from 1-Aug-09

The battery life seemed a bit off at 4 hours, so I opened it up
and made some measurements.

With backlight on, playing the thing draws some 221 mA

With a 600mA/h battery thats a life of 2hr 40.
 
Backlight off, playing few hundred KHz encoded mp3 files, draws
60-65 mA depending on track, volume, etc. That should run 9-10 hours
depending mainly on the backlight.

Most of my music is ogg, however.

That tends to draw a similar current (perhaps a ma more) most of the
time, but spikes to 118ma for about 330ms every (about) 2.6 seconds.

I suspected disk activity till I realized it was just on ogg files.
Any clues as to what the decoder could be doing here?

John

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Received on 2009-08-29


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