Looks like a "Deans" connector. I have used Deans connectors for secure high amperage, low voltage, battery connections. If that is on the battery, then whoever put that on used the wrong end. The battery needs to have the female connector. Risk of short and sparks and fire too high when the male end is on the battery.
Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links. To read our full affiliate disclosure statement please click Here.