Fault with SNMP monitoring UPS Network Management Card 3

[KDrain]

I have an APC Smart-UPS SRT 5000 which is monitored using SNMPv3 via the UPS Network Management Card 3 using firmware 2.5.3.3. Our monitoring solution is throwing alerts for "Battery lifetime is not okay" for some battery cartridges. This trigger is from the MIB:

                  name: '{#BATTERY_PACK}.{#CARTRIDGE_INDEX}: Battery lifetime is not okay'
                  opdata: 'Current bit set: {ITEM.LASTVALUE1}'
                  priority: WARNING
                  description: |
                    The battery cartridge health.
                      bit 0 Battery lifetime okay
                      bit 1 Battery lifetime near end, order replacement cartridge
                      bit 2 Battery lifetime exceeded, replace battery
                      bit 3 Battery lifetime near end acknowledged, order replacement cartridge
                      bit 4 Battery lifetime exceeded acknowledged, replace battery
                      bit 5 Battery measured lifetime near end, order replacement cartridge
                      bit 6 Battery measured lifetime near end acknowledged, order replacement cartridge

This appears to be because some of the OIDs returned are the wrong value:

iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.1.1.1 = STRING: "1000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.1.1.2 = STRING: "0000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.2.1.1 = STRING: "1000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.2.1.2 = STRING: "1000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.3.1.1 = STRING: "1000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.3.1.2 = STRING: "1000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.4.1.1 = STRING: "1000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.4.1.2 = STRING: "0000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.5.1.1 = STRING: "1000000000000000"
iso.3.6.1.4.1.318.1.1.1.2.3.10.2.1.7.5.1.2 = STRING: "1000000000000000"

The GUI shows the status for Battery 1, Cartridge 2 and Battery 4, Cartridge 2 are OK. So why are the SNMP OIDs reporting a 0 in the first bit (Not okay) and 0 for all other bits and not indicating any other fault?