I used one from about Sep 2018 to Dec 2019 on a weekly basis, both rehearsals and gigs, never any issues at all. I`ve still got it and it still works so although they say that once the battery goes that`s it, bin time, it seems that the battery will take a lot of recharging before finally giving up.
We also used to play some pretty big stages and the only time I had a very minor problem was when one of the security staff stood with his foot virtually on it, so stopped the signal intermittently.