You might be able to do something like that with relays.
AGS is a battery manufacture, they specialize in SLA type used in UPS. Should work if connected correctly to APC UPS. I connected a flooded Lead Acid battery and it worked.
If not then more information will be necessary to figure out why. Battery voltage when connected, How doe the newer ones work with it ect. Many more.
Have fun, Scott. [ Parent ]