Question

When does the potential difference between the two terminals of the battery be zero?
I think it will be zero if the battery is consumed entirely or when the circuit is open.
I thought a lot but have no good answer, please help
Agree if the battery is dead BUT
If the circuit is open the voltage is whatever the battery was charged to.
If the circuit is "shot circuited", the terminals connected by a thick wire of zero resistance, the current becomes infinite and the voltage zero
V = i R
V = i (0) = 0
Ok, but is there a wire with no resistance.
And why we neglict the internal resistance of the battery (r)?

Related Questions

Why is the potential difference between the terminals of a battery is not always equal to the e m f... When a battery is not used in a circuit, a voltmeter measure 1.492V across the terminals of the batt... A battery has an unknown e.m.f, ε,and an internal resistance r = 0.40Ω. When a resistance R = 5.60Ω... The potential difference across the terminals of a storage battery not connected in any circuit is o...