After I found out, that the battery lifetime from my five used button1 can tracked from my Smarthome System called Openhab3, I was
making a rules which sends me mails, when the battery from the botton1 is under 20%
Here is an interesting graph, which shows th drain out from the battery over time:
What can be noticed?
- The button1 will never 100% charged
- From 90% to 20% it takes around 4-5 month
--> That means I have to recharge the button1's 2-3 times a year.