Batteries

Batteries only hold so much power
To keep individual clocks ticking.
Eventually, there comes an hour
When the hands on the face will stop kicking.
How will a clock react when this day comes?
Does it continue to live by design,
Making sure the mechanism still hums,
Ignoring inevitable decline?
Or will it fight against the coming end?
Will it play around with the way time moves,
Speeding up or slowing down, which depends
On the feel how the situation grooves.
Can you tell me which behavior is right
When a time piece puts up its final fight?