Two old remote control cars not working properly (Dodleston CH4)

My son had a to see if we could make these work but not very successfully - I think one moves but only a tiny range, and the other didn't move? It's possible that the aerials have just broken or that there's a need for better batteries. Would anybody like to have them to see if they can make them operational again?
Both are 27 MHz. Also have a separate pair 40 MHz please see separate posting.
Collection from Dodleston please.
Collection from Dodleston please.
Nicola
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