after replacing the battery, all lights flasing and no o.p.
after replacing the battery after long non use all the lights are flashing and and no output
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If the batteries have been replaced the UPS may need to charge them before it will respond correctly. Leave the UPS plugged in but off for 8 hours, then try again; before blaming a circuit board.
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kvpselvam all LED's flashing at the same time indicates an internal fault. Time to take it apart and check the circuit boards and capacitors.
da oldturkey03