On Wed, 27 Sep 2023, Dick Steffens wrote: > After the power was restored, when I turned the unit back on, it > >went through a repeating cycle of beep-beep, shut down, then beep-beep, > >shut down, and so on. Is it possible that more than the battery may be the > >problem?
On Wed, Sep 27, 2023 at 12:36:49PM -0700, Rich Shepard wrote: > Have you opened the case and put a multimeter on the battery(ies) to test > the voltage? Intertubes Sez that the Cyberpower 800AVR uses one SP12-7.5 SLA battery, which should produce perhaps 13 to 14 volts disconnected. That Sealed Lead-Acid battery is probably six cells in series, and if one cell has reverse-charged, the voltage will be too low and the battery not chargeable. Batteries are unrepairable black boxes (literally) - though in my case I might attempt to nurse the SLA back to health with a lab power supply and a Dremel tool to unseal the "Sealed". I void warranties for sport - it's the Linux Way. Replacement SLA are easy to find - Interstate All Battery Center has them (some of their stores only have car batteries) and Batteries Plus has them. They can test the old battery, but they might not honestly tell you if it still works (and your 800AVR is borked instead). I'm nursing my ancient UPS units along, until somebody starts selling consumer-grade UPS with LiFePO₄ (Lithium Iron Phosphide) batteries in them. More energy, much lighter, more durable, environmentally cleaner. But in 2023, vehicles and data centers consume most lithium battery production, so consumers are stuck with heavy toxic lead monster UPS. Please recycle, so the SLA ends up in an Asian rather than a North American landfill. (Note: SLA and LiFePO₄ charge/discharge differently) If I had three lifetimes remaining, I would design my own LiFePO₄ UPS. It might be possible to hack an SLA UPS circuit to use a same-size LiFePO₄, but I don't have time for that either. Life is choices, and I choose to end this email now, thank goodness for you. Keith L. -- Keith Lofstrom [email protected]
