
And there's even a backup BATTERY
when the power goes out.
The Big Bang Theory Season 6, Episode 21

A little mercury switch,
9-volt BATTERY,
Breaking Bad Season 2, Episode 10

trickle-charge the BATTERY.
Breaking Bad Season 2, Episode 9

Why do you still have a BATTERY
in that thing? Take it out.
Breaking Bad Season 5, Episode 10

A BATTERY is a galvanic cell.
Breaking Bad Season 2, Episode 9