The benefits of the manual design over an electronic, or a mechanic exoskeleton are quite significant you really would never run out of power, energy, etc… that is until your body gives up, the skeleton also has a huge reduction in weight, and really cant malfunction due to programing errors etc. Simply, one just uses movements and mechanics.
So these group of Japanese engineers created a project that they call Skeletonics. This exoskeleton really doesn’t have any electronic mechanical parts like servo motors, or any other type of machines to operate it’s moving parts. This exoskeleton is more of a traditional exoskeletons. Instead, these guys went with a series of levers, springs, and pulleys to create the movements of the exoskeleton.