Bit of wildlife film that's connected to a battery (9,4)

'bit of wildlife film' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'connected to a battery' is the wordplay.
I cannot quite see how this works, but
'to' is present in the answer.
'a' is found in the answer.
'battery' could be 'c' (C battery is an example) and 'c' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'that's' acts as a link.

Can you help me to learn more?