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List:       rockbox
Subject:    Re: Ipod battery status with rockbox
From:       Mark Allums <mark () allums ! com>
Date:       2008-03-29 5:34:16
Message-ID: 47EDD4D8.4040001 () allums ! com
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Mark Allums wrote:
> Ed Nickl wrote:
>> Hi.
>>
>>          Running a 5.5G Ipod video with a current build of rockbox.  Just
>>     after boot up the battery reading is lower then it should be
>>     sometimes 20% lower and then after a minute or 2 it jumps up to
>>     where it's suppose to be.  Any reason for why this is?
>>               Was it cold when you first turned it on?  The battery 
>> will show more
>>     voltage when warmed up.
> 
> 
> With lithium ion batteries, this shouldn't happen too much.  This will 
> happen especially with zinc carbon and alkaline batteries, or lead acid, 
> like a car battery, but the lithium batteries are good to about -20C.  I 
> would think that warming up from room temp (about 60-70 degrees F) to 
> operating temp (about 80-100 degrees F) wouldn't cause that much 
> difference.
> 
> Just speculating.


I've thought about it, and parts of the battery will probably get hotter 
than 100 F, maybe 150 degrees even, but still.  I can see a rise from 
50% to 65%, but weren't some people reporting much higher rises?

It may not be Rockbox, it may be the battery, or the chip in lithium ion 
  batteries.

I am not an expert on this at all, but I think it is good that some 
people brought it to our attention.

--MArk Allums
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