With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoEnvMonVoltageLastShutdown
cisco Environmental Monitor Voltage Last Shutdown
1.3.6.1.4.1.9.9.13.1.2.1.6
The value of the associated instance of the object ciscoEnvMonVoltageStatusValue at the time an emergency shutdown of the managed device was last initiated. This value is stored in non-volatile RAM and hence is able to survive the shutdown.
Back to CISCO-ENVMON-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoEnvMonVoltageLastShutdown on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.