The information in the BatteryStatus field on the asset page of this UPS is directly retrieved from SNMP of the device in question, so I assume the OID from which the battery information is retrieved is still returning a normal "BatteryStatus". If a rescan still yields a normal BatteryStatus this means that the APC UPS isn't updating every field related to its battery to reflect that one of the batteries is faulty, as Lansweeper is merely reading out what it finds.
