In my experience with Cens, poor longevity, poor battery life- less than a day on occasion, one packed in working reliablyafter a year, other is on the way out after three years, don't handle rain well (and of course we only shoot in dry weather!). But much the same applied to the other make I had before- hoped that improvements in micro electronics would have helped when I bought these.One battery in my NHS hearing aid lasts weeks in daily use so I struggle to understand
I am now using mine as passive plugs with the supplied blanks but it makes them very expensive moulded passive plugs.