Comments on: Apple Video Ipod - Battery Life analysis HDD vs. CF

By: jonas

jonas — Mon, 12 May 2008 09:06:33 +0000

hi tarkan, i’m thinking about updating my 3d gen ipod to flash memory an wondered if the cache (i think its about 32 mb) thats normally filled from the harddrive decreases the battery life and could be deactivated?

By: Tarkan

Tarkan — Sat, 23 Feb 2008 21:39:59 +0000

With a set of earphones plugged in and higher the volume level, more the current draw - but I would stress that runtime differences will be minimal, maybe 3 to 5%.

My battery tests where carried out using 50 Ohms loads on the earphone output at quite a high volume level - I think my results probably represent worst case situation of someone listening to their earphones at the highest volume level.

Most earphones DC resistance rest in the 20 to 32 Ohm range, but their AC resistance i.e. while music is being played can range from 30 to 2000 or 3000 Ohms. So you cannot just use the DC resistance to determine what kind of current will be drawn by the earphones.

By: Dave

Dave — Sat, 23 Feb 2008 17:37:47 +0000

What effects does the volume level have on the results? Does the a higher volume shorten the battery life?

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