I have a few of the ZME-WALLC-S switches. These are low cost battery operated wall switches and I'm satisfied with those.
There is one issue - when one of the first batteries was empty and I replace it: the new battery drains quite quickly. I don't have exact data unfortunately but when I had a lifetime of the battery of almost a year it reduces to few weeks. I have a wakeup interval for once daily. That is not extreme ambicious I would say.
For one of the switches I had to completely remove it from the network because the battery drained within a few days and that becomes expensive over the months.
I thought that it occasionally happened that the switch got mechanically stuck, which may have caused it to continuously being not in sleep mode, but thats hard to check. For others I'm quite sure that this did not happen and still the battery life seems to shorten.
Anyone same experiences, explanations or suggestions?