I Change once a year and put small amount of wd40 with rag on battery before I install them . Even if the battery are good because I keep my mag lights in my cars and I am afraid the heat from the summer may make the battery leak.
has worked for the last ten years on three lights.
good luck
I have two bath rooms one with a bath tub each has a toilet .
Here what I have going on some time when one of them are flushed it will not drain so we use a plunger and it will drain we have to do this with them every now and then they may work fine for a month and not work for a week .
I have...