Here's an interesting article on the design of electric motorcycles comparing the various design aspects of the bike :
https://www.formtrends.com/electric-motorcycle-design-thinking-outside-the-box/
which is going to be obisously different compared to a conversion :
https://www.instructables.com/Engineer-Your-Own-Electric-Motorcycle/
and
https://www.instructables.com/Build-Your-Own-ELECTRIC-MOTORCYCLE/
which will be dependent on the type of parts and/or kits available :
https://ddmotorsystems.com/ElectricMotorcycles.php
however in terms of emerging technologies, i think that these (3) are what are most important :
but i am going to also say that these emerging systems are going to differentiate optional features :
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