flat battery BrE
dead battery AmE

His body seemed like a dead battery that could not be recharged.

Actually, it could mean a number of different things, including engine troubles or a dead battery.

The phone, the radio don't work when the battery's dead.

"You can't even get your car started when the battery's dead!"

He didn't want to find a dead battery in the middle of anything.

A dead or dying battery is not the only thing that can make your clock lose time.

Yes, and a flat tire is better than a dead battery.

They're delayed at the store due to a dead battery.

It was back at the house, on the dresser with a dead battery.

A car with a dead battery can run off its generator only so long.