I have several sensors that have been at 1% for over a month, and several that have been at 100% for over 3 months. I found after wasting many batteries because I thought I'd either got a bad batch that were already dead or was afraid of them dying and not knowing I just changed them.
Now I started using this app and it's great.
It runs a report everyday and sends me a list of all my battery devices and the last time they "checked in" So once a day I look at the pushover notification on my phone (or dashboard) and make sure each one has today's day of the week listed by them, thereby knowing they are still working. Whenever one becomes a day behind, I change the battery. I don't even watch the battery status's anymore at all.
