Currently, Cyberpower SNMP MIB is 0.51. I replaced cyberpower-mib.c 0.51 by 0.52 ( https://github.com/networkupstools/nut/blame/master/drivers/cyberpower-mib.c ).
I recompiled Debian packages and installed it. Result is ok: # upsc ups4@localhost Init SSL without certificate database battery.charge: 100 battery.current: 0 battery.runtime: 2700 battery.runtime.elapsed: 0 battery.temperature: 25 device.contact: Administrator device.description: UPS SNMP Card device.location: local info - baie gauche device.mfr: CYBERPOWER device.model: PR5000ELCDRTXL5U device.serial: 2 device.type: ups driver.name: snmp-ups driver.parameter.mibs: cyberpower driver.parameter.pollinterval: 2 driver.parameter.port: 192.168.33.244 driver.parameter.snmp_version: v1 driver.parameter.synchronous: auto driver.version: 2.8.0 driver.version.data: cyberpower MIB 0.52 driver.version.internal: 1.21 input.frequency: 50 input.voltage: 221 output.current: 0 output.frequency: 50 output.voltage: 221 ups.delay.reboot: 0 ups.delay.shutdown: 180 ups.delay.start: 0 ups.firmware: 4.200 ups.load: 42 ups.mfr: CYBERPOWER ups.model: PR5000ELCDRTXL5U ups.serial: 2 ups.status: OL -- Jean-Yves Boisiaud - Alcor Consulting 49, rue du Chemin Vert 49300 Cholet mobile : +33 6 63 71 73 46