Robotic Fish Is Powered by 'Robot-Blood' and Has No Battery 
By Jessica Miley US Source: interesting engineering 6/20/2020
Jessica Miley
Credit: JAmes Pickul
It's propelled by a dual-function fluid that is pulsated through the body of the fish through a simple circulatory mechanism – similar to blood (and otherwise described as "robot blood").
The big innovation

The innovation surrounding this fish is its complete lack of an isolated battery unit.
 

Integrating the battery function into the body of the robot has the advantage of cutting down on weight, while also augmenting maneuverability. Ultimately, the movement of the liquid helps propel the fish and retain buoyancy, as contrasted with a simple battery, which would merely restrain movement.

 
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