Re: [NTLK] Re - Backup Battery Instl

From: Owen Strawn (owenstrawn_at_kscable.com)
Date: Fri Dec 14 2001 - 08:27:18 EST


Hmm, I wonder if this may explain why the AAs discharged so quickly even
with no use for the last few days. I thought they were just old
batteries, but maybe the Newt was pushing alot of current across that
short...
Owen

> There are two aspects:
>
> 1) in most cases the backup battery (if discharged and/or at end of life) will still have a few
> millivolts left
> 2) a short between the contacts means in other words a very low resistance between the contact
> a discharged battery will have a low resistance, but higher than a short
> if there is no battery at all, you will have a very high resistance between the contacts and
> thus a undefined potential
> Considering the Newt to measure this voltage with relatively high impedance you have the solution.
>
> Johannes

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