I have a tinyRTC module that i want to use in a clock project.
My question is do i have to connect it to the arduino 5v or can i just run it from the backyp battery. 3.3v to 4.1v
My idea is to have a li ion battery powering the rtc and the arduino. However if i connect the rtc to 5v arduino it wil use the battery to charge the battery.....
So, is it possible to just connect the poles of the backup battery holder to the main battery?