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Rockbox mail archiveSubject: RE: My first post... and question.RE: My first post... and question.
From: Jammit Timmaj <jammit999_at_hotmail.com>
Date: Wed, 7 May 2008 19:36:57 +0000 > Date: Tue, 6 May 2008 11:03:34 -0500 > From: mark_at_allums.com > To: rockbox_at_cool.haxx.se > Subject: Re: My first post... and question. > > Jammit Timmaj wrote: > > > > > > I figured the battery capacity was more a guess than a science because > > the actual battery itself doesn't have any built in electronics for > > detecting charge state like a laptop battery does. Consider this > > question answered. Thanks. > > > > Actually if it's a LiIon battery, it probably *does* have a chip. (I > would be happy to be wrong about this.) Whether the iPod uses it, I > couldn't guess. If Rockbox relies on a hard-coded value for the > capacity, charging could get ugly if the battery is replaced with one > that has less capacity. Or as Dell laptop owners like to say, "Boom!" > Makes me glad the Sansa e200 code uses the original firmware for charging. > > -- > Mark Allums Hey, I have a Dell and it still "mostly" works... The 1st gen iPod I have was given to me broken (fell off a car on the highway at speeds of 60 mi/h). The HD was bad and the original battery was simply old. A new HD fixed the machine, and the new battery was added as a bonus (new chemistry, longer runtime). Unfortunately those were the only things broken on it and I never had to test the battery charging circuit or anything else. If I did have to fix those I would know more about how it works. There /is/ a chip, but it doesn't "speak". It only protects the battery during charge/discharge. Kind of like a smart fuse. It has no outside communication. I thought battery life was estimated in software and learned the battery behavior. I believe the main guts of the iPod only regulates the firewire 12V down to something like 5V, then the chip on the Li+ battery regulates the power going into the battery. I'm sure the MAX1555 is a similar chip: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4002 _________________________________________________________________ Invite your mail contacts to join your friends list with Windows Live Spaces. It's easy! http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us Received on 2008-05-07 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |