Monitoring Battery Health in sensors

I am looking to add some logic to monitor the battery heath of various sensor devices and am looking for what others have done … Some of my sensors have the following battery related status:

“Battery Voltage” - Number:ElectricalPotential
“Battery Level” - Number
“Battery Alarm” - String
“Low Battery” - Switch

zigbee_manufacturercode = 0x1241
vendor = Samjin

Any thoughts on which one would be the best to monitor health? Seems the simplest would be to just watch the “Low Battery”.