Are they rechargeable?

I would have thought that a realistic load and voltage drop measurement
might be a good idea, certainly. I have an old laptop where the battery
reads fine after a charge, for all of five minutes in use!
Brian

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"DerbyBorn" wrote in message
2.222...
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?