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From: "Peter Nolan"
References: <firstname.lastname@example.org> <3D7FC59B.A6E8520F@xympatico.ca>
Subject: Re: How do I measure watch battery life?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Thu, 12 Sep 2002 12:07:10 +0100
NNTP-Posting-Date: Thu, 12 Sep 2002 11:57:17 BST
I've often wondered how this was done.
It looks like from what you said one simply measures the voltage across the
battery till it reaches some value as you say provided by the manufacturers.
I had ideas along the lines that the battery was checked by placing a load
across it(a resistor) at regular intervals determined by circuitry in the
device and then looking at it's response.
I guess it's more of a matter of knowing exactly how the voltage across a
battery betrays it's charge capacity. I didn't think the two things were
I should enquire more instead of trying to figure everything out somehow.
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"Joseph Legris" wrote in message
> John wrote:
> > Hello.. I am designing a device that runs off of a 3V watch battery,
> > and need some way to determine the life of the battery (and output
> > this in terms of logic). I was thinking of a simple comparator, but I
> > don't know what to use as a reference voltage. Any help would be
> > greatly appreciated.
> That's the way to do it. Look up the battery specs on the manufacturer's
> website. They should show a graph depicting the voltage discharge curve,
> from which you can read off the end-of-charge voltage.
> Best regards,
> Joseph Legris
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