I'd say they're toast!
Yesterday, during the automatic self-test of my #Eaton Ellipse Pro 1600 (DIN) #UPS, it failed and shut my whole network down, ungracefully.
The original LEOCH DJW12-9.0 sealed lead-acid #SLA #batteries aren't holding a (reasonable amount of) charge anymore.
They've been in use since 2020-11, that's over 5 years. Eaton recommends replacing after 2 years.
👀👉 IMG ALT TXT
🧵 2/n OK, that's not too bad - 37 bucks, to make a 280 bucks UPS go brrr again.
BTW, Copilot says, that there aren't any Lithium based alternatives, that can handle the high discharge current (up to 45A at 2S/24V) required for a 1000W UPS. EDIT: the 9Ah #LiFePO4 alternatives i've found max out at 10A continuous - 2x 100-120W ain't enough for a 1kW UPS.
🧵 4/n i'm not quite sure why those are called SEALED lead-acid #SLA #batteries. A silicone-rubber bung doesn't seem like much of a SEAL. AGM tech, i guess - Absorbent Glass Mat. Edit: "sealed", as in non-spillable, i guess.
Yeah, i'm currently evaluating the "add distilled water" method - 2.5ml per cell (6 cells make a 12V battery). Preliminary results in pic2/pic3. 👀 IMG ALT TXT
Multi Purr Puss 
