Support and General Use > Hardware

Experiments on power consumption (iPOD 5G, 30G)

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Buschel:
@Saratoga: No, I did not find anything yet.

@Patwa: The battery lifetime depends on your settings and the file formats you are playing. E.g. EQ costs additional CPU (and therefore battery lifetime), .mpc will consume less power than .mp3-playback. Also: the higher the bitrates of files, the higher the power consumption (through more often HDD-activities as well as higher CPU-load). Good idea is to run a battery bench and post all your settings as well as the file format, bitrate and overall size of the folder.

@All:
From iPOD-site -> iPOD Video runtime = 14h with 400mAh-battery -> 29mA consumption
Rockbox (from battery benchs) -> 7.5 - 8h with 400mAh -> 50-53mA consumption
Sansa E200 can save 4mA through disabling ATA if not used
Sansa E200 can save 12mA through disabling LCD if backlight off
-> If Sansa E200-patches could be done on iPOD Video the runtime would be able to go up to 400 / (53-4-12) = 10.8h

Another question is the HDD itself. From Toshiba-site: 30GB HDD in sleep mode takes 20mA. Is it possible to switch off/on the whole HDD power consumption and do re-inits on demand?

DefineByte:
Could the method for turning off the LCD be brute-forced or is there not enough to go on?

Buschel:
From my side I cannot go on as the information about how to disable components like LCD is not available.

Llorean:
As a note, the Apple Firmware very clearly doesn't turn off the LCD, so that alone at least isn't one of the major causes of concern.

While the Sansa is unreadable without the backlight on (or very nearly so), iPod LCDs are very readable without the backlight on and turning them off is probably a usability handicap (though might be acceptable as an option.)

I do think we already turn the iPod HDs off (though I'm not certain, I just know we do it on some other players).

linuxstb:

--- Quote from: Llorean on May 25, 2007, 12:53:18 PM ---I do think we already turn the iPod HDs off (though I'm not certain, I just know we do it on some other players).

--- End quote ---

Rockbox does power-down the hard disk on most players, but not ipods (beyond spinning the disk down and putting it in sleep mode).

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