How to connect battery to arduino?

Question

Arduino

How to connect a battery to arduino uno so that when the external "source" is disconnected, it continues to work from arduino uno, and when there is a main network, the battery is charged?
As I understand it, there should be something like this, but I don’t know exactly how to hook the plus of the battery

Answer 1

i.e. like this? https://pp.vk.me/c630618/v630618014/33bcd/IbdMDvp7...

Yes, you can do that too.