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<http://amcdawes.com>
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