What are the steps to import a laptop and its batteries in Mauritius?

Are you allowed to import the battery with the laptop ? Do you need an permit for the battery or is it better to import the laptop without battery and purchase the battery locally? How can you know if a seller is genuine? What has been your experience? Do you need a broker? Is the customs fees only 15% Do you have to take a trade license or insurance? If so where do you look for them