On Fri, 27 May 2016 06:53:38 -0700, Tim R wrote:

Originally a battery lasted at least couple of years. CR2s are about
$10 each, so that wasn't bad.

Now it's a couple of weeks. They seem to discharge when not being used.
Is that characteristic of an older electronic device, that it may
develop some small leakage current over time. I can leave the battery
out until I need it, but I'm curious.

It's certainly characteristic of batteries bought off Ebay or other
dubious sources. Could that be your problem?