I get it, but I've never had a problem in 35 years (lucky!) and with a bunch of basses it's easier for me to just test them periodically.I'd highly recommend changing the batteries at least once every two years, regardless capacity. Leaving them for so long might start licking. I bought a mint 2009 BT4 few years back and the signal would drop down and come back up. Took some time to realize that was the reason. I had to replace both battery clips with the (black/red) wire which was eaten from within.
