The site says everywhere that it uses salt, but this is misleading. It&#x27;s not table salt, it&#x27;s a special salt. (Using table salt to generate energy is ridiculous.) For example, the site tries to ensure the product is safe because it only use salt and water, but it&#x27;s not the salt that everyone imagines.<p>Now, if it uses a special salt, what&#x27;s the difference between this and an usual AAA battery?<p>From the FAQ:<p>&gt; <i>What is myFC Puck made of?</i><p>&gt; <i>The body of the Puck is an aluminum can that holds the binary fuel, Sodium silicide and Sodium borohydride (CAS number: 12164-12-4 &amp; 16940-66-2). The aluminum can is then permanently attached to a plastic cap, which is used to control the release of hydrogen gas to the fuel cell. After the fuel mixture is fully reacted, the Puck will contain two benign by-products (sodium silicate and sodium metaborate).</i><p>&gt; <i>Both by-products are chemically benign, non-hazardous, and safe. In fact, these by-products are used in many industrial manufacturing processes and many common household products (like concrete, detergent, glass, makeup, and toothpaste) are produced using these materials.</i>