Hi Stephen
Please will you define thin? WE really need to know the diameter of the wire and the type of plug fitted to answer your question. A photo would be useful.
dave976

hi yes they are nimih and have thin wires hence my question

A racing NIMH battery wud hav connections to support a higher-current discharge,for speed. The wires wud be thicker, the connector wud be a high-end one, & the welded straps between cells wud be wider & thicker. You can use a race battery in a more-mild performing boat,running it for a longer period of time. For racing I wud pick LIPO, for crusing I wud pick NIMH. I prefer NIMH as there is less chance of a fire or explosion, whether charging or discharging....or just plain storage.

Hi batteries are batteries, just use them as you want.
Roy