Identifying Power Connectors?
Measure the pitch (distance between the pins) first; that will help narrow down the choices. Go to Digikey and peruse the 2 pin cable mount (free hanging) connectors. Look through the photos until you see something that matches. It looks like a 0.100" pitch connector. There are a few main manufacturers of these type of connectors, with Molex and TE Connectivity being popular. Then there are a whole bunch of knockoffs of the popular connectors.