Thanks for reply, larsks.
The connector is the problem. It has two connecting parts. I charged the battery and when I removed it from the charger the connecting parts separated, leaving one in the charger. Attempting to prise out the part stuck in the charger, it broke, leaving a broken piece firmly jammed in the charger. So I now have a naffed charger and a battery I cant connect to the motor, or charge, without the missing part of the connector.
