Unless you're worried about breaking a tamper indicating seal or something, I think that unsoldering the piezo beeper is the way to solve that problem.
On May 24, 2015 9:21:18 AM PDT, "Dawes, Andrew M." <[email protected]> wrote: >Yeah, a cap might work although sounds like the charger would view that >as a bad battery (ie too short a lifetime). I may throw my old battery >in and take current data for 24hours to see what it does and get an >idea of how it monitors battery health. > >The box works fine without the battery, it just beeps every 10 min or >so. Ok for me since it is buried in my basement; not ideal for >apartment dwellers. > >Andy > >Sent from my phone using voice-recognition software and/or clumsy >thumbs, please forgive any typos. > >On May 24, 2015, at 5:57 AM, William Wilson ><[email protected]<mailto:[email protected]>> wrote: > >I've been using "supercaps" (in series of 5) to replace (12v) batteries >a lot, or as "ad-hoc UPS" inline with any device's 12v power supply... >like modems without a battery slot. Anywhere that really fast charging >may be needed and amp draw of the device is fairly low. Maxwell brand >is cheapest I've seen without wating for shipping from china. > >connected to an actual charging circuit, depending on the type of >charger it may not work (had problem with some lithium chargers) > >that said, I think I remember seeing a few models of home internet box >that actually ran fine with the battery removed. > > >On Sat, May 23, 2015 at 6:02 PM, Jerry Biehler ><[email protected]<mailto:[email protected]>> wrote: >They might do it how other UPS units do it, they switch the device over >to the battery to run off it and watch the voltage drop. If it drops >too fast the battery is bad. > >-Jerry > >On May 23, 2015, at 5:55 PM, Dawes, Andrew M. ><[email protected]<mailto:[email protected]>> wrote: > >Now my curiosity is piqued beyond just stopping the beep… how would a >circuit tell between a battery and a voltage source like a large >capacitor? Perhaps measure a few points of the discharge curve or >something clever like that? > >On May 23, 2015, at 4:53 PM, Jerry Biehler ><[email protected]<mailto:[email protected]>> wrote: > >Not sure, it seems on mine it could actually detect a battery that was >not so hot even though it had a full charge. After a few days it would >start beeping at me again. And for $10 you really cant mess around with >tricking the system. > >-Jerry > >On May 23, 2015, at 4:35 PM, Jason Barnett ><[email protected]<mailto:[email protected]>> wrote: > >You could try throwing a capacitor in place of the battery. It won't >help in case of a power outage, but neither will a bad battery... > > >On Sat, May 23, 2015, 12:19 PM Jerry Biehler ><[email protected]<mailto:[email protected]>> wrote: >No, assuming the battery charger is even a remotely recent design it is >measuring the voltage of the battery so you would have to have >something there for it to measure. And I am pretty sure these chargers >are actually pretty smart. I have one of these fios boxes too. > >On Saturday, May 23, 2015, Dawes, Andrew M. ><[email protected]<mailto:[email protected]>> wrote: >You would have to fake out the battery charger into thinking it is at >voltage. >Yes, so I guess my question was: would a zener diode rated at the >battery voltage do that, or does it depend on the implementation of the >charger? > >They have tested good used batteries that will fit at surplusgizmos for >$10. >Good to know, thanks! > >-Andy > > > >On May 23, 2015, at 11:29 AM, Dawes, Andrew M. ><[email protected]<mailto:[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<http://amcdawes.com> > >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber > >-- >Andrew M.C. Dawes >Associate Professor of Physics >Pacific University >amcdawes.com<http://amcdawes.com> > >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber > >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber > >-- >Andrew M.C. Dawes >Associate Professor of Physics >Pacific University >amcdawes.com<http://amcdawes.com> > >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber > >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber > >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected]<mailto:[email protected]> >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber > > >------------------------------------------------------------------------ > >_______________________________________________ >dorkbotpdx-blabber mailing list >[email protected] >http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber
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