I fixed mine by wiring in an old 12vdc. 500ma wall wart. This powers the UPS circuit while at the same time it keeps the battery topped off just like the internal circuit is supposed to... but no longer does.
I have a Smart-UPS® RT UPS that is lighting the LED internal fault. Can anyone tell me what UPS circuit monitors this internal fault to myself repair the board? This failure is default PWM circuit or the control board?
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First tell how old is your UPS ?
if its older by two to three years may be the Battery eeds a replacement .Try charging the battery externally with a good battery chargers but before charging externally please take out the battery outside.
Then if the battery shows very low voltage even after charging for some 8 hours then you have one alternative that is replace with new battery.and promptly keep it under charge with out fail.
If so, then it has developed a fault. Check the battery fault light on the UPS panel. Perhaps it's battery is dead, or batery charging circuitry is faulty. Anyway, it would most probably need professional attention by a serviceperson.
If it did not, double check whether you have connected the computer etc. to the proper sockets - many UPS devices have a couple of UPS-powered sockets plus additional sockets with surge protection only (no UPS power!) for high power devices like laser printers etc.
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Try leaving it off, but plugged into the wall outlet so the batteries can charge up. If they are new, they are probably without a charge. The instructions should indicate how long it needs to charge - probably most of the day.
You can increase the capacity of the batteries from the original equipment, but you cannot put more load onto the UPS. Your runtime may be increased, but you may have trouble fitting the car batteries into the case. Some UPS's have external connectors for external battery packs. Find one of those and add the batteries to it. Make sure that you maintain the DC voltage which the UPS requires. It may be 12 volts or 24volts. Two 12 volt batteries in Series.