Enerwave ZWN-BPC

I have two of these which i purchased in 2015. I never used one of them (still in the box) but the second one worked fine. A while back it stopped reporting any information. It showed in the UI as active with batteries at 100%. Even when i removed the batteries. I could’nt exclude it either. I thought it was just dead. I tried using the other one that had never been used and cant pair it.
Any ideas?