Need help from an electrician 😊?

Ok i have a camera little one. I want to run it without its battery inserted into it. Straight from the charger that gives same amount of volts to make it run. Battery have 3 points one + one - and one have T sign on it. When i remove the battery it stops working. You can take example of laptops . If you remove their battery you can still use it by direct current from the charger . So i want same with my camera. Can those 3 points help me or i need to open it and do something complex.