>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 09 August 2005 13:42
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE[ Re: Measurement of cell voltages within a battery
>
>
>Vasile Surducan wrote:
>
>>   You are trying to brake a good rule of measurements: do not 
>> influence the measured value with your measurement system. When the 
>> battery is going to die, your system will be valuable like 
>the battery 
>> itself.
>
>Not necessarily... with ~24 V nominal battery voltage, it's 
>quite possible to report a critical condition of the battery 
>to a higher-order supervisor system (that's not dependent on 
>the battery) way before the battery is too weak to supply the 
>battery supervision circuit.
>
>So while one could say that /after/ the battery died, the 
>circuit that's powered by the battery is not worth much 
>anymore, it still is worth something (and can be worth /a 
>lot/) when the battery is still /going to die/ -- that is, 
>before it actually died. And probably even help prevent that 
>the battery in fact is going to die...
>
>Gerhard

Exactly, this is essentialy the point of any battery monitoring system, i.e. to let the user/other systems know how much capacity is remaining, not to tell them the battery is dead.

Regards

Mike

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