<https://www.optimabatteries.com/experience/blog/what-is-the-difference-between-an-h6-h7-battery>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.optimabatteries.com/experience/blog/what-is-the-difference-between-an-h6-h7-battery>