DC UPS module 15 Red alarm led

Hi i recently installed DC UPS MODULE 15 WITH THE BATTERY. INPUT SUPPLY, BATTERY AND OUTPUT SUPPLY ALL NORMAL. I CHECKED POLARITY ALSO ALL GOOD. BUT STILL RED ALARM LED ILLUMINATED. WHAT IS THE SOLUTION?? 

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HI, 

     RECENTLY I installed DC UPS module 15 with battery. After connection input, battery supply and output all normal. But still red alarm LED illuminated. Please give some suggestions to solve this issue.. 

Hello Vickyeo1993,

SITOP DC-UPS-Module 15 - Operating Instructions

Causes for the "battery not ready" state in normal operation are as follows: "OFF" operating state, no battery module connected, reversed polarity or defective battery (battery voltage < 18.5V) or open circuit between battery and UPS module.

Is battery connected correctly?

Is battery defective?

Regards,

Frink