DerbyBorn explained on 15/02/2019 :
For some reasone I have a Burglar Alarm serviced every year - it is
wireless.

The guy usually puts a voltmeter on the various batteries and usually
declares them okay for another year.

I would thing the no-load voltage is a poor indication of likely life. Am I
right?

Yes, it is pointless - even off charge it takes a while for battery
volts to fall. The proper test method is a drop test - a suitable load
is applied and then the voltage monitored, for a rough idea.