Battery in a drum rolled out
That's enough to power a computer workstation for 2 or 3 days, or to recharge a cell phone almost indefinitely, according to Younicos, the German company that invented the pack.
The mobile energy storage unit, called Yill, is a couple of feet in diameter, about the size of a small bass drum, with a handle and wheels. It recharges in about four hours in a 220-volt electric outlet.
Related News

Florida Court Blocks Push to Break Electricity Monopolies
MIAMI - Florida’s top court ruled against a proposed constitutional amendment that would have allowed customers to pick their electricity provider, threatening monopolies held by NextEra Energy Inc. and Duke Energy Corp.
In a ruling Thursday, the court said the petition’s language is “misleading” and doesn’t comply with requirements to be included on the 2020 ballot. The measure’s sponsor, Citizens for Energy Choice, said the move ends the initiative.
“While we were confident in our plan to gather the remaining signatures required, we cannot overcome this last obstacle,” the group’s chair, Alex Patton, said in a statement.
The proposed measure was one of…