You would have to fake out the battery charger into thinking it is at voltage.
They have tested good used batteries that will fit at surplusgizmos for $10. -Jerry > On May 23, 2015, at 11:29 AM, Dawes, Andrew M. <[email protected]> wrote: > > I have a battery backup system as part of my Fiber-to-the-home service from a > certain regional telecom provider. The battery for this system is a 12V > sealed lead-acid battery (not unlike a golf cart or scooter battery). The > trouble is that there is a system alarm when the battery “wears out” and > needs to be replaced ― it’s been beeping every 8-9 minutes for the past few > months. I’m not really interested in consuming another battery for no real > reason (I don’t need backup because if the power is out at my house I have no > need for internet access). That said, I’m thinking of a non-destructive way > to trick the charger/alarm circuit into thinking it has a fully-charged, new > & happy 12V battery. > > I don’t know much about lead-acid charger circuits but I suspect some sort of > current-limited voltage-regulated supply that alarms when the battery no > longer holds 11V or some other specified threshold. > > Would a simple 12V zener diode work, or would a charge circuit just dump a > wasteful amount of current into the diode? Perhaps a 13V zener so that no > current even flows? I have easy access to the battery terminals, and medium > access to the rest of the circuit. > > I’m ok with mangling the alarm itself, but I’d prefer a nice “plug-n-play” > solution since I know at least three friends in a similar situation who > aren’t as destructive. > > -Andy > > > > -- > Andrew M.C. Dawes > Associate Professor of Physics > Pacific University > amcdawes.com > > _______________________________________________ > dorkbotpdx-blabber mailing list > [email protected] > http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber
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