All battery charge lights flash simultaneously
APC Smart-UPS 1000XL. All battery charge lights flash simultaneously. What does this mean?
Computers & Internet - APC - Smart-UPS 1000VA UPS System
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THIS seems the be the answer to your question. Hope this helps
APC UPS SURT8000XLI works on A/C Voltage only. When A/C fails, it does not switch to DC operation. It is discovered that there is no input voltage to relay (CT70A-24C5 12AF06-2000) which I believe transfers to DC.
The batteries are not charged when A/C power supply is avaliable.
My UPS back UPS ES 500 all lights glow simultanously and i'm unable to turn it off or on too whats the solutiion