Did I fry the battery?

Bonehead move…I attempted to insert the connector for my smartphone headset in one of the ports of my Mac Book Pro that it looked like it fit. The screen went blank, the computer was making a low humming sound. The external charger was not connected at the time, but the battery had been fully charged. When I turned the computer back on it recovered and displayed normally, so I think the CPU is fine, but the battery condition icon showed a completely depleted battery (X), and I got a warning that the battery was nearly depleted and would shutdown momentarily. When I attach the external charger, no light comes on in the connector to indicate it is charging. Do you think I just damaged the battery and that’s why it refuses to accept a charge, and a new battery would solve the problem? Or do you think I might have caused some other circuitry damage? I AM NOT a computer person, just a 69 year old wanting his computer to work, but I think I could handle a battery change-out if you think that is what it is likely to be. Thanks in advance for any help you can provide.