HI David-
Yes, this is true, you need an internet connection to switch modes of the EasyBloom sensor. For example, when you're in Monitor mode, the EasyBloom website is needed to "set" the monitoring plant. With the plant, the EasyBloom can signal when the plant needs water. (All plants have different watering needs).
We're working on some future features to address the battery reset issues.
I'm sorry you're not happy with the need for an internet connection, I remember discussing this with you over email in August.
Edith
PS. What are you growing?