Robots can now store energy to allow for up to 72 times more power after a battery breakthrough, scientists have claimed.
University of Michigan researchers, funded by the US Department of Defense, have developed a new rechargeable zinc battery.
Previously robots were restricted by their need for batteries that could use up 20 per cent of space inside the body.
But the new system allows for distributed energy storage similar to human fat reserves, they claim.
Nicholas Kotov, a professor of engineering who led the study, said: “Robot designs are restricted by the need for batteries that often occupy 20 per cent or more of the available space inside a robot, or account for a similar proportion of the robot’s weight.
“We don’t have a single sac of fat, which would be bulky and require a lot of costly energy transfer.
"Distributed energy storage, which is the biological way, is the way to go for highly efficient biomorphic devices.”
This could help humanoid robots work within human environments, the study adds.
Mingqiang Wage, a researcher, added: “This is not the limit, however,” said Mingqiang Wang, a visiting researcher at Professor Kotov’s lab.
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“We estimate that robots could have 72-times more power capacity if their exteriors were replaced with zinc batteries, compared to having a single lithium-ion battery.”
The paper was published in the journal, Science Robots.
Earlier today, Daily Star Online revealed how sex robots were on course to become so realistic one customer vowed to never date real women again.
In her book, Sex Robots & Vegan Meat, author Jenny Kleeman writes: "The men here didn't sound much like the disabled, lonely or socially excluded customers that Matt or Douglas like to talk about.
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"Several mentioned their wives and girlfriends, and compared them unfavourably to their silicone doll mistresses.
"One included a sex doll for Roberto to use as an aesthetic guide when planning his robot's proportions.
"She was in leopard print underwear, propped up in front of a wall adorned with daggers, mounted hunting knives and a bladed knuckleduster.
"'If my RealDoll could cook, clean, and screw whenever I wanted, I'd never date again,' he wrote.
"'That's what I really want, but that is just wishful thinking.'"
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