If I unwrapped the outside plastic cover on a rechargeable battery NiMH for the Kodak cameras can I still use it?

Yes, but you should wrap the area that was previously covered by the wrapper and paper or plastic ring with electrical tape to avoid a possible short circuit. If you still have the paper or plastic ring, put it over the positive terminal and let the electrical tape cover it. Do not put tape over the terminals. Use only one layer of electrical tape so the battery will fit more easily in the battery compartment. If electrical tape makes the battery too big to fit into the compartment, you may use Scotch tape, but I would recommend electrical tape if it will fit.