The popular Tamiya Connectors are a user friendly and safe choice for e.g. batteries or chargers. This is the most common model in airsoft guns and batteries. This model has gold-plated contact pins.
Note! The male and female sides of Tamiya connectors have been named in a way that is different from the common standard. Normally, connectors are named according to the metal contact pins, but in the case of the Tamiya connectors, a connector with a female plastic body and male contact pins is often referred to as the female connector. Keep this in mind when choosing your connectors.