Question

a battery is placed inside this​

Answer 1

Battery inside a Lithium Ion (Li-on)

Answer 2

[The following Question seems to be incomplete]

but here yours answer for that

BATTERY-

battery is a device consisting of one or more electrochemical cells with external connections for powering electrical devices such as flashlights, mobile phones, and electric cars

A battery is placed inside Circuit for the flow of electricity

HOPE IT HELPS