APC 1500 New - Charged for 24hrs , only 4 lamps displayed , reset systems , no improvment, still 4

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APC 1500 New - Charged for 24hrs ,

only 4 lamps displayed , reset systems , no improvment, still 4 lamps , is there a practiical way to reset the charge monitor circuit so that it uses the existing battery pack with voltage on or over 27.5 volts DC and shows 5 lamps .

Putting a battery pack from a 5 lamp displayed UPS into a 4 lamp ups unit , does not change the status from 4 lamps being displayed .

another batch we are testing so far has 4 more 4 lamp units ... is this a flaw with the charging scaling circuit ? all battery voltages are over 27.5 Vdc .

Please advise soonest ,

Thanks !Anthony

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