![And there's even a backup battery
when the power goes out.
And there's even a backup battery
when the power goes out.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
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,
A little mercury switch,
9-volt battery,](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
A little mercury switch,
9-volt BATTERY,
Breaking Bad Season 2, Episode 10
![trickle-charge the battery.
trickle-charge the battery.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
trickle-charge the BATTERY.
Breaking Bad Season 2, Episode 9
![Why do you still have a battery
in that thing? Take it out.
Why do you still have a battery
in that thing? Take it out.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
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.
A battery is a galvanic cell.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
A BATTERY is a galvanic cell.
Breaking Bad Season 2, Episode 9