They would charge from the grid and would be useful for backup power ... for commercial use. The technology appears promising, and it could become more widely used in residential battery backup ...

As someone who experiences regular power ... having a backup plan for electric outages is essential for my home. While you can always use a gasoline- or propane-powered generator, a battery ...

Potomac Edison will use the battery to provide backup power to customers on that line, reducing the duration of outages experienced, until crews are able to make repairs and restore service.