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Yeah, I wondered about that - I've only really plugged plasticky connectors into each other so I'd hope nothing was loose/free enough to be shorting. TBH the car is due some attention so if a new battery is the answer that wouldn't be the end of the world at all. Presumably having roadside assistance, getting them out is the best way to find out what's happened?
Sounds like you need to check for a short to earth which could be e.g. a live wire in contact with the car body.
Next possibility is you have inadvertently killed the battery and will need to replace it.